From 7acf12193b22057b5bf3db2eef5d8f17784bcd8f Mon Sep 17 00:00:00 2001
From: "stainless-app[bot]"
 <142633134+stainless-app[bot]@users.noreply.github.com>
Date: Wed, 9 Apr 2025 19:21:03 +0000
Subject: [PATCH] refactor(client): migrate pages to builder pattern

---
 .../com/withorb/api/models/AlertListPage.kt   | 116 +++++++----
 .../withorb/api/models/AlertListPageAsync.kt  | 120 +++++++----
 .../com/withorb/api/models/CouponListPage.kt  | 112 +++++++---
 .../withorb/api/models/CouponListPageAsync.kt | 116 ++++++++---
 .../api/models/CouponSubscriptionListPage.kt  | 113 +++++++---
 .../models/CouponSubscriptionListPageAsync.kt | 117 ++++++++---
 .../withorb/api/models/CreditNoteListPage.kt  | 111 +++++++---
 .../api/models/CreditNoteListPageAsync.kt     | 114 +++++++---
 .../CustomerBalanceTransactionListPage.kt     | 137 ++++++++-----
 ...CustomerBalanceTransactionListPageAsync.kt | 140 ++++++++-----
 ...ustomerCreditLedgerListByExternalIdPage.kt | 191 ++++++++---------
 ...erCreditLedgerListByExternalIdPageAsync.kt | 194 ++++++++----------
 .../models/CustomerCreditLedgerListPage.kt    | 186 ++++++++---------
 .../CustomerCreditLedgerListPageAsync.kt      | 190 ++++++++---------
 .../CustomerCreditListByExternalIdPage.kt     | 120 +++++++----
 ...CustomerCreditListByExternalIdPageAsync.kt | 123 +++++++----
 .../api/models/CustomerCreditListPage.kt      | 116 +++++++----
 .../api/models/CustomerCreditListPageAsync.kt | 118 +++++++----
 ...CustomerCreditTopUpListByExternalIdPage.kt | 115 ++++++++---
 ...merCreditTopUpListByExternalIdPageAsync.kt | 118 ++++++++---
 .../api/models/CustomerCreditTopUpListPage.kt | 110 +++++++---
 .../CustomerCreditTopUpListPageAsync.kt       | 114 +++++++---
 .../withorb/api/models/CustomerListPage.kt    | 113 +++++++---
 .../api/models/CustomerListPageAsync.kt       | 116 ++++++++---
 .../models/DimensionalPriceGroupListPage.kt   | 109 +++++++---
 .../DimensionalPriceGroupListPageAsync.kt     | 112 +++++++---
 .../api/models/EventBackfillListPage.kt       | 115 ++++++++---
 .../api/models/EventBackfillListPageAsync.kt  | 117 +++++++----
 .../com/withorb/api/models/InvoiceListPage.kt | 120 +++++++----
 .../api/models/InvoiceListPageAsync.kt        | 123 +++++++----
 .../com/withorb/api/models/ItemListPage.kt    | 103 +++++++---
 .../withorb/api/models/ItemListPageAsync.kt   | 110 +++++++---
 .../com/withorb/api/models/MetricListPage.kt  | 109 +++++++---
 .../withorb/api/models/MetricListPageAsync.kt | 113 +++++++---
 .../com/withorb/api/models/PlanListPage.kt    | 108 +++++++---
 .../withorb/api/models/PlanListPageAsync.kt   | 115 ++++++++---
 .../com/withorb/api/models/PriceListPage.kt   | 109 +++++++---
 .../withorb/api/models/PriceListPageAsync.kt  | 113 +++++++---
 .../models/SubscriptionFetchSchedulePage.kt   | 115 ++++++++---
 .../SubscriptionFetchSchedulePageAsync.kt     | 118 ++++++++---
 .../api/models/SubscriptionListPage.kt        | 116 +++++++----
 .../api/models/SubscriptionListPageAsync.kt   | 119 +++++++----
 .../services/async/AlertServiceAsyncImpl.kt   |  10 +-
 .../services/async/CouponServiceAsyncImpl.kt  |  10 +-
 .../async/CreditNoteServiceAsyncImpl.kt       |  10 +-
 .../async/CustomerServiceAsyncImpl.kt         |  10 +-
 .../DimensionalPriceGroupServiceAsyncImpl.kt  |  10 +-
 .../services/async/InvoiceServiceAsyncImpl.kt |  10 +-
 .../services/async/ItemServiceAsyncImpl.kt    |  10 +-
 .../services/async/MetricServiceAsyncImpl.kt  |  10 +-
 .../services/async/PlanServiceAsyncImpl.kt    |  10 +-
 .../services/async/PriceServiceAsyncImpl.kt   |  10 +-
 .../async/SubscriptionServiceAsyncImpl.kt     |  20 +-
 .../coupons/SubscriptionServiceAsyncImpl.kt   |  10 +-
 .../BalanceTransactionServiceAsyncImpl.kt     |  10 +-
 .../async/customers/CreditServiceAsyncImpl.kt |  20 +-
 .../credits/LedgerServiceAsyncImpl.kt         |  20 +-
 .../credits/TopUpServiceAsyncImpl.kt          |  20 +-
 .../async/events/BackfillServiceAsyncImpl.kt  |  10 +-
 .../api/services/blocking/AlertServiceImpl.kt |   8 +-
 .../services/blocking/CouponServiceImpl.kt    |   8 +-
 .../blocking/CreditNoteServiceImpl.kt         |   8 +-
 .../services/blocking/CustomerServiceImpl.kt  |   8 +-
 .../DimensionalPriceGroupServiceImpl.kt       |  10 +-
 .../services/blocking/InvoiceServiceImpl.kt   |   8 +-
 .../api/services/blocking/ItemServiceImpl.kt  |   8 +-
 .../services/blocking/MetricServiceImpl.kt    |   8 +-
 .../api/services/blocking/PlanServiceImpl.kt  |   8 +-
 .../api/services/blocking/PriceServiceImpl.kt |   8 +-
 .../blocking/SubscriptionServiceImpl.kt       |  16 +-
 .../coupons/SubscriptionServiceImpl.kt        |  10 +-
 .../BalanceTransactionServiceImpl.kt          |  10 +-
 .../blocking/customers/CreditServiceImpl.kt   |  18 +-
 .../customers/credits/LedgerServiceImpl.kt    |  20 +-
 .../customers/credits/TopUpServiceImpl.kt     |  16 +-
 .../blocking/events/BackfillServiceImpl.kt    |   6 +-
 76 files changed, 3709 insertions(+), 1843 deletions(-)

diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/AlertListPage.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/AlertListPage.kt
index 968452486..e34c1eaf8 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/AlertListPage.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/AlertListPage.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.blocking.AlertService
 import java.util.Objects
 import java.util.Optional
@@ -9,27 +10,14 @@ import java.util.stream.Stream
 import java.util.stream.StreamSupport
 import kotlin.jvm.optionals.getOrNull
 
-/**
- * This endpoint returns a list of alerts within Orb.
- *
- * The request must specify one of `customer_id`, `external_customer_id`, or `subscription_id`.
- *
- * If querying by subscripion_id, the endpoint will return the subscription level alerts as well as
- * the plan level alerts associated with the subscription.
- *
- * The list of alerts is ordered starting from the most recently created alert. This endpoint
- * follows Orb's [standardized pagination format](/api-reference/pagination).
- */
+/** @see [AlertService.list] */
 class AlertListPage
 private constructor(
-    private val alertsService: AlertService,
+    private val service: AlertService,
     private val params: AlertListParams,
     private val response: AlertListPageResponse,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): AlertListPageResponse = response
-
     /**
      * Delegates to [AlertListPageResponse], but gracefully handles missing data.
      *
@@ -45,19 +33,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is AlertListPage && alertsService == other.alertsService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(alertsService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "AlertListPage{alertsService=$alertsService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -79,20 +54,75 @@ private constructor(
         )
     }
 
-    fun getNextPage(): Optional<AlertListPage> {
-        return getNextPageParams().map { alertsService.list(it) }
-    }
+    fun getNextPage(): Optional<AlertListPage> = getNextPageParams().map { service.list(it) }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): AlertListParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): AlertListPageResponse = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            alertsService: AlertService,
-            params: AlertListParams,
-            response: AlertListPageResponse,
-        ) = AlertListPage(alertsService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of [AlertListPage].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [AlertListPage]. */
+    class Builder internal constructor() {
+
+        private var service: AlertService? = null
+        private var params: AlertListParams? = null
+        private var response: AlertListPageResponse? = null
+
+        @JvmSynthetic
+        internal fun from(alertListPage: AlertListPage) = apply {
+            service = alertListPage.service
+            params = alertListPage.params
+            response = alertListPage.response
+        }
+
+        fun service(service: AlertService) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: AlertListParams) = apply { this.params = params }
+
+        /** The response that this page was parsed from. */
+        fun response(response: AlertListPageResponse) = apply { this.response = response }
+
+        /**
+         * Returns an immutable instance of [AlertListPage].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): AlertListPage =
+            AlertListPage(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: AlertListPage) : Iterable<Alert> {
@@ -113,4 +143,16 @@ private constructor(
             return StreamSupport.stream(spliterator(), false)
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is AlertListPage && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() = "AlertListPage{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/AlertListPageAsync.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/AlertListPageAsync.kt
index 8d822c7e0..8a37ce8d4 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/AlertListPageAsync.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/AlertListPageAsync.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.async.AlertServiceAsync
 import java.util.Objects
 import java.util.Optional
@@ -10,27 +11,14 @@ import java.util.concurrent.Executor
 import java.util.function.Predicate
 import kotlin.jvm.optionals.getOrNull
 
-/**
- * This endpoint returns a list of alerts within Orb.
- *
- * The request must specify one of `customer_id`, `external_customer_id`, or `subscription_id`.
- *
- * If querying by subscripion_id, the endpoint will return the subscription level alerts as well as
- * the plan level alerts associated with the subscription.
- *
- * The list of alerts is ordered starting from the most recently created alert. This endpoint
- * follows Orb's [standardized pagination format](/api-reference/pagination).
- */
+/** @see [AlertServiceAsync.list] */
 class AlertListPageAsync
 private constructor(
-    private val alertsService: AlertServiceAsync,
+    private val service: AlertServiceAsync,
     private val params: AlertListParams,
     private val response: AlertListPageResponse,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): AlertListPageResponse = response
-
     /**
      * Delegates to [AlertListPageResponse], but gracefully handles missing data.
      *
@@ -46,19 +34,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is AlertListPageAsync && alertsService == other.alertsService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(alertsService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "AlertListPageAsync{alertsService=$alertsService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -80,22 +55,78 @@ private constructor(
         )
     }
 
-    fun getNextPage(): CompletableFuture<Optional<AlertListPageAsync>> {
-        return getNextPageParams()
-            .map { alertsService.list(it).thenApply { Optional.of(it) } }
+    fun getNextPage(): CompletableFuture<Optional<AlertListPageAsync>> =
+        getNextPageParams()
+            .map { service.list(it).thenApply { Optional.of(it) } }
             .orElseGet { CompletableFuture.completedFuture(Optional.empty()) }
-    }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): AlertListParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): AlertListPageResponse = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            alertsService: AlertServiceAsync,
-            params: AlertListParams,
-            response: AlertListPageResponse,
-        ) = AlertListPageAsync(alertsService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of [AlertListPageAsync].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [AlertListPageAsync]. */
+    class Builder internal constructor() {
+
+        private var service: AlertServiceAsync? = null
+        private var params: AlertListParams? = null
+        private var response: AlertListPageResponse? = null
+
+        @JvmSynthetic
+        internal fun from(alertListPageAsync: AlertListPageAsync) = apply {
+            service = alertListPageAsync.service
+            params = alertListPageAsync.params
+            response = alertListPageAsync.response
+        }
+
+        fun service(service: AlertServiceAsync) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: AlertListParams) = apply { this.params = params }
+
+        /** The response that this page was parsed from. */
+        fun response(response: AlertListPageResponse) = apply { this.response = response }
+
+        /**
+         * Returns an immutable instance of [AlertListPageAsync].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): AlertListPageAsync =
+            AlertListPageAsync(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: AlertListPageAsync) {
@@ -123,4 +154,17 @@ private constructor(
             return forEach(values::add, executor).thenApply { values }
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is AlertListPageAsync && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() =
+        "AlertListPageAsync{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/CouponListPage.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/CouponListPage.kt
index 031a19168..8fd79bede 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/CouponListPage.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/CouponListPage.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.blocking.CouponService
 import java.util.Objects
 import java.util.Optional
@@ -9,23 +10,14 @@ import java.util.stream.Stream
 import java.util.stream.StreamSupport
 import kotlin.jvm.optionals.getOrNull
 
-/**
- * This endpoint returns a list of all coupons for an account in a list format.
- *
- * The list of coupons is ordered starting from the most recently created coupon. The response also
- * includes `pagination_metadata`, which lets the caller retrieve the next page of results if they
- * exist. More information about pagination can be found in the Pagination-metadata schema.
- */
+/** @see [CouponService.list] */
 class CouponListPage
 private constructor(
-    private val couponsService: CouponService,
+    private val service: CouponService,
     private val params: CouponListParams,
     private val response: CouponListPageResponse,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): CouponListPageResponse = response
-
     /**
      * Delegates to [CouponListPageResponse], but gracefully handles missing data.
      *
@@ -41,19 +33,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is CouponListPage && couponsService == other.couponsService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(couponsService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "CouponListPage{couponsService=$couponsService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -75,20 +54,75 @@ private constructor(
         )
     }
 
-    fun getNextPage(): Optional<CouponListPage> {
-        return getNextPageParams().map { couponsService.list(it) }
-    }
+    fun getNextPage(): Optional<CouponListPage> = getNextPageParams().map { service.list(it) }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): CouponListParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): CouponListPageResponse = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            couponsService: CouponService,
-            params: CouponListParams,
-            response: CouponListPageResponse,
-        ) = CouponListPage(couponsService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of [CouponListPage].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [CouponListPage]. */
+    class Builder internal constructor() {
+
+        private var service: CouponService? = null
+        private var params: CouponListParams? = null
+        private var response: CouponListPageResponse? = null
+
+        @JvmSynthetic
+        internal fun from(couponListPage: CouponListPage) = apply {
+            service = couponListPage.service
+            params = couponListPage.params
+            response = couponListPage.response
+        }
+
+        fun service(service: CouponService) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: CouponListParams) = apply { this.params = params }
+
+        /** The response that this page was parsed from. */
+        fun response(response: CouponListPageResponse) = apply { this.response = response }
+
+        /**
+         * Returns an immutable instance of [CouponListPage].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): CouponListPage =
+            CouponListPage(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: CouponListPage) : Iterable<Coupon> {
@@ -109,4 +143,16 @@ private constructor(
             return StreamSupport.stream(spliterator(), false)
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is CouponListPage && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() = "CouponListPage{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/CouponListPageAsync.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/CouponListPageAsync.kt
index bb16ee294..6486b6da2 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/CouponListPageAsync.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/CouponListPageAsync.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.async.CouponServiceAsync
 import java.util.Objects
 import java.util.Optional
@@ -10,23 +11,14 @@ import java.util.concurrent.Executor
 import java.util.function.Predicate
 import kotlin.jvm.optionals.getOrNull
 
-/**
- * This endpoint returns a list of all coupons for an account in a list format.
- *
- * The list of coupons is ordered starting from the most recently created coupon. The response also
- * includes `pagination_metadata`, which lets the caller retrieve the next page of results if they
- * exist. More information about pagination can be found in the Pagination-metadata schema.
- */
+/** @see [CouponServiceAsync.list] */
 class CouponListPageAsync
 private constructor(
-    private val couponsService: CouponServiceAsync,
+    private val service: CouponServiceAsync,
     private val params: CouponListParams,
     private val response: CouponListPageResponse,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): CouponListPageResponse = response
-
     /**
      * Delegates to [CouponListPageResponse], but gracefully handles missing data.
      *
@@ -42,19 +34,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is CouponListPageAsync && couponsService == other.couponsService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(couponsService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "CouponListPageAsync{couponsService=$couponsService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -76,22 +55,78 @@ private constructor(
         )
     }
 
-    fun getNextPage(): CompletableFuture<Optional<CouponListPageAsync>> {
-        return getNextPageParams()
-            .map { couponsService.list(it).thenApply { Optional.of(it) } }
+    fun getNextPage(): CompletableFuture<Optional<CouponListPageAsync>> =
+        getNextPageParams()
+            .map { service.list(it).thenApply { Optional.of(it) } }
             .orElseGet { CompletableFuture.completedFuture(Optional.empty()) }
-    }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): CouponListParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): CouponListPageResponse = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            couponsService: CouponServiceAsync,
-            params: CouponListParams,
-            response: CouponListPageResponse,
-        ) = CouponListPageAsync(couponsService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of [CouponListPageAsync].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [CouponListPageAsync]. */
+    class Builder internal constructor() {
+
+        private var service: CouponServiceAsync? = null
+        private var params: CouponListParams? = null
+        private var response: CouponListPageResponse? = null
+
+        @JvmSynthetic
+        internal fun from(couponListPageAsync: CouponListPageAsync) = apply {
+            service = couponListPageAsync.service
+            params = couponListPageAsync.params
+            response = couponListPageAsync.response
+        }
+
+        fun service(service: CouponServiceAsync) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: CouponListParams) = apply { this.params = params }
+
+        /** The response that this page was parsed from. */
+        fun response(response: CouponListPageResponse) = apply { this.response = response }
+
+        /**
+         * Returns an immutable instance of [CouponListPageAsync].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): CouponListPageAsync =
+            CouponListPageAsync(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: CouponListPageAsync) {
@@ -119,4 +154,17 @@ private constructor(
             return forEach(values::add, executor).thenApply { values }
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is CouponListPageAsync && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() =
+        "CouponListPageAsync{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/CouponSubscriptionListPage.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/CouponSubscriptionListPage.kt
index e32c6d862..77f174711 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/CouponSubscriptionListPage.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/CouponSubscriptionListPage.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.blocking.coupons.SubscriptionService
 import java.util.Objects
 import java.util.Optional
@@ -9,22 +10,14 @@ import java.util.stream.Stream
 import java.util.stream.StreamSupport
 import kotlin.jvm.optionals.getOrNull
 
-/**
- * This endpoint returns a list of all subscriptions that have redeemed a given coupon as a
- * [paginated](/api-reference/pagination) list, ordered starting from the most recently created
- * subscription. For a full discussion of the subscription resource, see
- * [Subscription](/core-concepts#subscription).
- */
+/** @see [SubscriptionService.list] */
 class CouponSubscriptionListPage
 private constructor(
-    private val subscriptionsService: SubscriptionService,
+    private val service: SubscriptionService,
     private val params: CouponSubscriptionListParams,
     private val response: Subscriptions,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): Subscriptions = response
-
     /**
      * Delegates to [Subscriptions], but gracefully handles missing data.
      *
@@ -40,19 +33,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is CouponSubscriptionListPage && subscriptionsService == other.subscriptionsService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(subscriptionsService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "CouponSubscriptionListPage{subscriptionsService=$subscriptionsService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -74,20 +54,76 @@ private constructor(
         )
     }
 
-    fun getNextPage(): Optional<CouponSubscriptionListPage> {
-        return getNextPageParams().map { subscriptionsService.list(it) }
-    }
+    fun getNextPage(): Optional<CouponSubscriptionListPage> =
+        getNextPageParams().map { service.list(it) }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): CouponSubscriptionListParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): Subscriptions = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            subscriptionsService: SubscriptionService,
-            params: CouponSubscriptionListParams,
-            response: Subscriptions,
-        ) = CouponSubscriptionListPage(subscriptionsService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of [CouponSubscriptionListPage].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [CouponSubscriptionListPage]. */
+    class Builder internal constructor() {
+
+        private var service: SubscriptionService? = null
+        private var params: CouponSubscriptionListParams? = null
+        private var response: Subscriptions? = null
+
+        @JvmSynthetic
+        internal fun from(couponSubscriptionListPage: CouponSubscriptionListPage) = apply {
+            service = couponSubscriptionListPage.service
+            params = couponSubscriptionListPage.params
+            response = couponSubscriptionListPage.response
+        }
+
+        fun service(service: SubscriptionService) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: CouponSubscriptionListParams) = apply { this.params = params }
+
+        /** The response that this page was parsed from. */
+        fun response(response: Subscriptions) = apply { this.response = response }
+
+        /**
+         * Returns an immutable instance of [CouponSubscriptionListPage].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): CouponSubscriptionListPage =
+            CouponSubscriptionListPage(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: CouponSubscriptionListPage) : Iterable<Subscription> {
@@ -108,4 +144,17 @@ private constructor(
             return StreamSupport.stream(spliterator(), false)
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is CouponSubscriptionListPage && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() =
+        "CouponSubscriptionListPage{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/CouponSubscriptionListPageAsync.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/CouponSubscriptionListPageAsync.kt
index 460589f69..47417e21c 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/CouponSubscriptionListPageAsync.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/CouponSubscriptionListPageAsync.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.async.coupons.SubscriptionServiceAsync
 import java.util.Objects
 import java.util.Optional
@@ -10,22 +11,14 @@ import java.util.concurrent.Executor
 import java.util.function.Predicate
 import kotlin.jvm.optionals.getOrNull
 
-/**
- * This endpoint returns a list of all subscriptions that have redeemed a given coupon as a
- * [paginated](/api-reference/pagination) list, ordered starting from the most recently created
- * subscription. For a full discussion of the subscription resource, see
- * [Subscription](/core-concepts#subscription).
- */
+/** @see [SubscriptionServiceAsync.list] */
 class CouponSubscriptionListPageAsync
 private constructor(
-    private val subscriptionsService: SubscriptionServiceAsync,
+    private val service: SubscriptionServiceAsync,
     private val params: CouponSubscriptionListParams,
     private val response: Subscriptions,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): Subscriptions = response
-
     /**
      * Delegates to [Subscriptions], but gracefully handles missing data.
      *
@@ -41,19 +34,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is CouponSubscriptionListPageAsync && subscriptionsService == other.subscriptionsService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(subscriptionsService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "CouponSubscriptionListPageAsync{subscriptionsService=$subscriptionsService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -75,22 +55,80 @@ private constructor(
         )
     }
 
-    fun getNextPage(): CompletableFuture<Optional<CouponSubscriptionListPageAsync>> {
-        return getNextPageParams()
-            .map { subscriptionsService.list(it).thenApply { Optional.of(it) } }
+    fun getNextPage(): CompletableFuture<Optional<CouponSubscriptionListPageAsync>> =
+        getNextPageParams()
+            .map { service.list(it).thenApply { Optional.of(it) } }
             .orElseGet { CompletableFuture.completedFuture(Optional.empty()) }
-    }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): CouponSubscriptionListParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): Subscriptions = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            subscriptionsService: SubscriptionServiceAsync,
-            params: CouponSubscriptionListParams,
-            response: Subscriptions,
-        ) = CouponSubscriptionListPageAsync(subscriptionsService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of
+         * [CouponSubscriptionListPageAsync].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [CouponSubscriptionListPageAsync]. */
+    class Builder internal constructor() {
+
+        private var service: SubscriptionServiceAsync? = null
+        private var params: CouponSubscriptionListParams? = null
+        private var response: Subscriptions? = null
+
+        @JvmSynthetic
+        internal fun from(couponSubscriptionListPageAsync: CouponSubscriptionListPageAsync) =
+            apply {
+                service = couponSubscriptionListPageAsync.service
+                params = couponSubscriptionListPageAsync.params
+                response = couponSubscriptionListPageAsync.response
+            }
+
+        fun service(service: SubscriptionServiceAsync) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: CouponSubscriptionListParams) = apply { this.params = params }
+
+        /** The response that this page was parsed from. */
+        fun response(response: Subscriptions) = apply { this.response = response }
+
+        /**
+         * Returns an immutable instance of [CouponSubscriptionListPageAsync].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): CouponSubscriptionListPageAsync =
+            CouponSubscriptionListPageAsync(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: CouponSubscriptionListPageAsync) {
@@ -118,4 +156,17 @@ private constructor(
             return forEach(values::add, executor).thenApply { values }
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is CouponSubscriptionListPageAsync && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() =
+        "CouponSubscriptionListPageAsync{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/CreditNoteListPage.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/CreditNoteListPage.kt
index 4e94cace1..cbbd4f40b 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/CreditNoteListPage.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/CreditNoteListPage.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.blocking.CreditNoteService
 import java.util.Objects
 import java.util.Optional
@@ -9,21 +10,14 @@ import java.util.stream.Stream
 import java.util.stream.StreamSupport
 import kotlin.jvm.optionals.getOrNull
 
-/**
- * Get a paginated list of CreditNotes. Users can also filter by customer_id, subscription_id, or
- * external_customer_id. The credit notes will be returned in reverse chronological order by
- * `creation_time`.
- */
+/** @see [CreditNoteService.list] */
 class CreditNoteListPage
 private constructor(
-    private val creditNotesService: CreditNoteService,
+    private val service: CreditNoteService,
     private val params: CreditNoteListParams,
     private val response: CreditNoteListPageResponse,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): CreditNoteListPageResponse = response
-
     /**
      * Delegates to [CreditNoteListPageResponse], but gracefully handles missing data.
      *
@@ -39,19 +33,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is CreditNoteListPage && creditNotesService == other.creditNotesService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(creditNotesService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "CreditNoteListPage{creditNotesService=$creditNotesService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -73,20 +54,75 @@ private constructor(
         )
     }
 
-    fun getNextPage(): Optional<CreditNoteListPage> {
-        return getNextPageParams().map { creditNotesService.list(it) }
-    }
+    fun getNextPage(): Optional<CreditNoteListPage> = getNextPageParams().map { service.list(it) }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): CreditNoteListParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): CreditNoteListPageResponse = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            creditNotesService: CreditNoteService,
-            params: CreditNoteListParams,
-            response: CreditNoteListPageResponse,
-        ) = CreditNoteListPage(creditNotesService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of [CreditNoteListPage].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [CreditNoteListPage]. */
+    class Builder internal constructor() {
+
+        private var service: CreditNoteService? = null
+        private var params: CreditNoteListParams? = null
+        private var response: CreditNoteListPageResponse? = null
+
+        @JvmSynthetic
+        internal fun from(creditNoteListPage: CreditNoteListPage) = apply {
+            service = creditNoteListPage.service
+            params = creditNoteListPage.params
+            response = creditNoteListPage.response
+        }
+
+        fun service(service: CreditNoteService) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: CreditNoteListParams) = apply { this.params = params }
+
+        /** The response that this page was parsed from. */
+        fun response(response: CreditNoteListPageResponse) = apply { this.response = response }
+
+        /**
+         * Returns an immutable instance of [CreditNoteListPage].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): CreditNoteListPage =
+            CreditNoteListPage(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: CreditNoteListPage) : Iterable<CreditNote> {
@@ -107,4 +143,17 @@ private constructor(
             return StreamSupport.stream(spliterator(), false)
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is CreditNoteListPage && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() =
+        "CreditNoteListPage{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/CreditNoteListPageAsync.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/CreditNoteListPageAsync.kt
index 7e1104d7b..104920cc9 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/CreditNoteListPageAsync.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/CreditNoteListPageAsync.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.async.CreditNoteServiceAsync
 import java.util.Objects
 import java.util.Optional
@@ -10,21 +11,14 @@ import java.util.concurrent.Executor
 import java.util.function.Predicate
 import kotlin.jvm.optionals.getOrNull
 
-/**
- * Get a paginated list of CreditNotes. Users can also filter by customer_id, subscription_id, or
- * external_customer_id. The credit notes will be returned in reverse chronological order by
- * `creation_time`.
- */
+/** @see [CreditNoteServiceAsync.list] */
 class CreditNoteListPageAsync
 private constructor(
-    private val creditNotesService: CreditNoteServiceAsync,
+    private val service: CreditNoteServiceAsync,
     private val params: CreditNoteListParams,
     private val response: CreditNoteListPageResponse,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): CreditNoteListPageResponse = response
-
     /**
      * Delegates to [CreditNoteListPageResponse], but gracefully handles missing data.
      *
@@ -40,19 +34,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is CreditNoteListPageAsync && creditNotesService == other.creditNotesService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(creditNotesService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "CreditNoteListPageAsync{creditNotesService=$creditNotesService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -74,22 +55,78 @@ private constructor(
         )
     }
 
-    fun getNextPage(): CompletableFuture<Optional<CreditNoteListPageAsync>> {
-        return getNextPageParams()
-            .map { creditNotesService.list(it).thenApply { Optional.of(it) } }
+    fun getNextPage(): CompletableFuture<Optional<CreditNoteListPageAsync>> =
+        getNextPageParams()
+            .map { service.list(it).thenApply { Optional.of(it) } }
             .orElseGet { CompletableFuture.completedFuture(Optional.empty()) }
-    }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): CreditNoteListParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): CreditNoteListPageResponse = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            creditNotesService: CreditNoteServiceAsync,
-            params: CreditNoteListParams,
-            response: CreditNoteListPageResponse,
-        ) = CreditNoteListPageAsync(creditNotesService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of [CreditNoteListPageAsync].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [CreditNoteListPageAsync]. */
+    class Builder internal constructor() {
+
+        private var service: CreditNoteServiceAsync? = null
+        private var params: CreditNoteListParams? = null
+        private var response: CreditNoteListPageResponse? = null
+
+        @JvmSynthetic
+        internal fun from(creditNoteListPageAsync: CreditNoteListPageAsync) = apply {
+            service = creditNoteListPageAsync.service
+            params = creditNoteListPageAsync.params
+            response = creditNoteListPageAsync.response
+        }
+
+        fun service(service: CreditNoteServiceAsync) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: CreditNoteListParams) = apply { this.params = params }
+
+        /** The response that this page was parsed from. */
+        fun response(response: CreditNoteListPageResponse) = apply { this.response = response }
+
+        /**
+         * Returns an immutable instance of [CreditNoteListPageAsync].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): CreditNoteListPageAsync =
+            CreditNoteListPageAsync(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: CreditNoteListPageAsync) {
@@ -117,4 +154,17 @@ private constructor(
             return forEach(values::add, executor).thenApply { values }
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is CreditNoteListPageAsync && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() =
+        "CreditNoteListPageAsync{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerBalanceTransactionListPage.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerBalanceTransactionListPage.kt
index 3188929b4..a313acd6a 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerBalanceTransactionListPage.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerBalanceTransactionListPage.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.blocking.customers.BalanceTransactionService
 import java.util.Objects
 import java.util.Optional
@@ -9,42 +10,14 @@ import java.util.stream.Stream
 import java.util.stream.StreamSupport
 import kotlin.jvm.optionals.getOrNull
 
-/**
- * ## The customer balance
- *
- * The customer balance is an amount in the customer's currency, which Orb automatically applies to
- * subsequent invoices. This balance can be adjusted manually via Orb's webapp on the customer
- * details page. You can use this balance to provide a fixed mid-period credit to the customer.
- * Commonly, this is done due to system downtime/SLA violation, or an adhoc adjustment discussed
- * with the customer.
- *
- * If the balance is a positive value at the time of invoicing, it represents that the customer has
- * credit that should be used to offset the amount due on the next issued invoice. In this case, Orb
- * will automatically reduce the next invoice by the balance amount, and roll over any remaining
- * balance if the invoice is fully discounted.
- *
- * If the balance is a negative value at the time of invoicing, Orb will increase the invoice's
- * amount due with a positive adjustment, and reset the balance to 0.
- *
- * This endpoint retrieves all customer balance transactions in reverse chronological order for a
- * single customer, providing a complete audit trail of all adjustments and invoice applications.
- *
- * ## Eligibility
- *
- * The customer balance can only be applied to invoices or adjusted manually if invoices are not
- * synced to a separate invoicing provider. If a payment gateway such as Stripe is used, the balance
- * will be applied to the invoice before forwarding payment to the gateway.
- */
+/** @see [BalanceTransactionService.list] */
 class CustomerBalanceTransactionListPage
 private constructor(
-    private val balanceTransactionsService: BalanceTransactionService,
+    private val service: BalanceTransactionService,
     private val params: CustomerBalanceTransactionListParams,
     private val response: CustomerBalanceTransactionListPageResponse,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): CustomerBalanceTransactionListPageResponse = response
-
     /**
      * Delegates to [CustomerBalanceTransactionListPageResponse], but gracefully handles missing
      * data.
@@ -63,19 +36,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is CustomerBalanceTransactionListPage && balanceTransactionsService == other.balanceTransactionsService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(balanceTransactionsService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "CustomerBalanceTransactionListPage{balanceTransactionsService=$balanceTransactionsService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -97,20 +57,80 @@ private constructor(
         )
     }
 
-    fun getNextPage(): Optional<CustomerBalanceTransactionListPage> {
-        return getNextPageParams().map { balanceTransactionsService.list(it) }
-    }
+    fun getNextPage(): Optional<CustomerBalanceTransactionListPage> =
+        getNextPageParams().map { service.list(it) }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): CustomerBalanceTransactionListParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): CustomerBalanceTransactionListPageResponse = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            balanceTransactionsService: BalanceTransactionService,
-            params: CustomerBalanceTransactionListParams,
-            response: CustomerBalanceTransactionListPageResponse,
-        ) = CustomerBalanceTransactionListPage(balanceTransactionsService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of
+         * [CustomerBalanceTransactionListPage].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [CustomerBalanceTransactionListPage]. */
+    class Builder internal constructor() {
+
+        private var service: BalanceTransactionService? = null
+        private var params: CustomerBalanceTransactionListParams? = null
+        private var response: CustomerBalanceTransactionListPageResponse? = null
+
+        @JvmSynthetic
+        internal fun from(customerBalanceTransactionListPage: CustomerBalanceTransactionListPage) =
+            apply {
+                service = customerBalanceTransactionListPage.service
+                params = customerBalanceTransactionListPage.params
+                response = customerBalanceTransactionListPage.response
+            }
+
+        fun service(service: BalanceTransactionService) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: CustomerBalanceTransactionListParams) = apply { this.params = params }
+
+        /** The response that this page was parsed from. */
+        fun response(response: CustomerBalanceTransactionListPageResponse) = apply {
+            this.response = response
+        }
+
+        /**
+         * Returns an immutable instance of [CustomerBalanceTransactionListPage].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): CustomerBalanceTransactionListPage =
+            CustomerBalanceTransactionListPage(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: CustomerBalanceTransactionListPage) :
@@ -132,4 +152,17 @@ private constructor(
             return StreamSupport.stream(spliterator(), false)
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is CustomerBalanceTransactionListPage && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() =
+        "CustomerBalanceTransactionListPage{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerBalanceTransactionListPageAsync.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerBalanceTransactionListPageAsync.kt
index 83adacec9..6214987f0 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerBalanceTransactionListPageAsync.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerBalanceTransactionListPageAsync.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.async.customers.BalanceTransactionServiceAsync
 import java.util.Objects
 import java.util.Optional
@@ -10,42 +11,14 @@ import java.util.concurrent.Executor
 import java.util.function.Predicate
 import kotlin.jvm.optionals.getOrNull
 
-/**
- * ## The customer balance
- *
- * The customer balance is an amount in the customer's currency, which Orb automatically applies to
- * subsequent invoices. This balance can be adjusted manually via Orb's webapp on the customer
- * details page. You can use this balance to provide a fixed mid-period credit to the customer.
- * Commonly, this is done due to system downtime/SLA violation, or an adhoc adjustment discussed
- * with the customer.
- *
- * If the balance is a positive value at the time of invoicing, it represents that the customer has
- * credit that should be used to offset the amount due on the next issued invoice. In this case, Orb
- * will automatically reduce the next invoice by the balance amount, and roll over any remaining
- * balance if the invoice is fully discounted.
- *
- * If the balance is a negative value at the time of invoicing, Orb will increase the invoice's
- * amount due with a positive adjustment, and reset the balance to 0.
- *
- * This endpoint retrieves all customer balance transactions in reverse chronological order for a
- * single customer, providing a complete audit trail of all adjustments and invoice applications.
- *
- * ## Eligibility
- *
- * The customer balance can only be applied to invoices or adjusted manually if invoices are not
- * synced to a separate invoicing provider. If a payment gateway such as Stripe is used, the balance
- * will be applied to the invoice before forwarding payment to the gateway.
- */
+/** @see [BalanceTransactionServiceAsync.list] */
 class CustomerBalanceTransactionListPageAsync
 private constructor(
-    private val balanceTransactionsService: BalanceTransactionServiceAsync,
+    private val service: BalanceTransactionServiceAsync,
     private val params: CustomerBalanceTransactionListParams,
     private val response: CustomerBalanceTransactionListPageResponse,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): CustomerBalanceTransactionListPageResponse = response
-
     /**
      * Delegates to [CustomerBalanceTransactionListPageResponse], but gracefully handles missing
      * data.
@@ -64,19 +37,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is CustomerBalanceTransactionListPageAsync && balanceTransactionsService == other.balanceTransactionsService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(balanceTransactionsService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "CustomerBalanceTransactionListPageAsync{balanceTransactionsService=$balanceTransactionsService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -98,22 +58,83 @@ private constructor(
         )
     }
 
-    fun getNextPage(): CompletableFuture<Optional<CustomerBalanceTransactionListPageAsync>> {
-        return getNextPageParams()
-            .map { balanceTransactionsService.list(it).thenApply { Optional.of(it) } }
+    fun getNextPage(): CompletableFuture<Optional<CustomerBalanceTransactionListPageAsync>> =
+        getNextPageParams()
+            .map { service.list(it).thenApply { Optional.of(it) } }
             .orElseGet { CompletableFuture.completedFuture(Optional.empty()) }
-    }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): CustomerBalanceTransactionListParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): CustomerBalanceTransactionListPageResponse = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            balanceTransactionsService: BalanceTransactionServiceAsync,
-            params: CustomerBalanceTransactionListParams,
-            response: CustomerBalanceTransactionListPageResponse,
-        ) = CustomerBalanceTransactionListPageAsync(balanceTransactionsService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of
+         * [CustomerBalanceTransactionListPageAsync].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [CustomerBalanceTransactionListPageAsync]. */
+    class Builder internal constructor() {
+
+        private var service: BalanceTransactionServiceAsync? = null
+        private var params: CustomerBalanceTransactionListParams? = null
+        private var response: CustomerBalanceTransactionListPageResponse? = null
+
+        @JvmSynthetic
+        internal fun from(
+            customerBalanceTransactionListPageAsync: CustomerBalanceTransactionListPageAsync
+        ) = apply {
+            service = customerBalanceTransactionListPageAsync.service
+            params = customerBalanceTransactionListPageAsync.params
+            response = customerBalanceTransactionListPageAsync.response
+        }
+
+        fun service(service: BalanceTransactionServiceAsync) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: CustomerBalanceTransactionListParams) = apply { this.params = params }
+
+        /** The response that this page was parsed from. */
+        fun response(response: CustomerBalanceTransactionListPageResponse) = apply {
+            this.response = response
+        }
+
+        /**
+         * Returns an immutable instance of [CustomerBalanceTransactionListPageAsync].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): CustomerBalanceTransactionListPageAsync =
+            CustomerBalanceTransactionListPageAsync(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: CustomerBalanceTransactionListPageAsync) {
@@ -146,4 +167,17 @@ private constructor(
             return forEach(values::add, executor).thenApply { values }
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is CustomerBalanceTransactionListPageAsync && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() =
+        "CustomerBalanceTransactionListPageAsync{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditLedgerListByExternalIdPage.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditLedgerListByExternalIdPage.kt
index 505a0c671..a791b9c6a 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditLedgerListByExternalIdPage.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditLedgerListByExternalIdPage.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.blocking.customers.credits.LedgerService
 import java.util.Objects
 import java.util.Optional
@@ -9,93 +10,14 @@ import java.util.stream.Stream
 import java.util.stream.StreamSupport
 import kotlin.jvm.optionals.getOrNull
 
-/**
- * The credits ledger provides _auditing_ functionality over Orb's credits system with a list of
- * actions that have taken place to modify a customer's credit balance. This
- * [paginated endpoint](/api-reference/pagination) lists these entries, starting from the most
- * recent ledger entry.
- *
- * More details on using Orb's real-time credit feature are [here](/product-catalog/prepurchase).
- *
- * There are four major types of modifications to credit balance, detailed below.
- *
- * ## Increment
- *
- * Credits (which optionally expire on a future date) can be added via the API ([Add Ledger
- * Entry](create-ledger-entry)). The ledger entry for such an action will always contain the total
- * eligible starting and ending balance for the customer at the time the entry was added to the
- * ledger.
- *
- * ## Decrement
- *
- * Deductions can occur as a result of an API call to create a ledger entry (see
- * [Add Ledger Entry](create-ledger-entry)), or automatically as a result of incurring usage. Both
- * ledger entries present the `decrement` entry type.
- *
- * As usage for a customer is reported into Orb, credits may be deducted according to the customer's
- * plan configuration. An automated deduction of this type will result in a ledger entry, also with
- * a starting and ending balance. In order to provide better tracing capabilities for automatic
- * deductions, Orb always associates each automatic deduction with the `event_id` at the time of
- * ingestion, used to pinpoint _why_ credit deduction took place and to ensure that credits are
- * never deducted without an associated usage event.
- *
- * By default, Orb uses an algorithm that automatically deducts from the _soonest expiring credit
- * block_ first in order to ensure that all credits are utilized appropriately. As an example, if
- * trial credits with an expiration date of 2 weeks from now are present for a customer, they will
- * be used before any deductions take place from a non-expiring credit block.
- *
- * If there are multiple blocks with the same expiration date, Orb will deduct from the block with
- * the _lower cost basis_ first (e.g. trial credits with a $0 cost basis before paid credits with a
- * $5.00 cost basis).
- *
- * It's also possible for a single usage event's deduction to _span_ credit blocks. In this case,
- * Orb will deduct from the next block, ending at the credit block which consists of unexpiring
- * credits. Each of these deductions will lead to a _separate_ ledger entry, one per credit block
- * that is deducted from. By default, the customer's total credit balance in Orb can be negative as
- * a result of a decrement.
- *
- * ## Expiration change
- *
- * The expiry of credits can be changed as a result of the API (See
- * [Add Ledger Entry](create-ledger-entry)). This will create a ledger entry that specifies the
- * balance as well as the initial and target expiry dates.
- *
- * Note that for this entry type, `starting_balance` will equal `ending_balance`, and the `amount`
- * represents the balance transferred. The credit block linked to the ledger entry is the source
- * credit block from which there was an expiration change
- *
- * ## Credits expiry
- *
- * When a set of credits expire on pre-set expiration date, the customer's balance automatically
- * reflects this change and adds an entry to the ledger indicating this event. Note that credit
- * expiry should always happen close to a date boundary in the customer's timezone.
- *
- * ## Void initiated
- *
- * Credit blocks can be voided via the API. The `amount` on this entry corresponds to the number of
- * credits that were remaining in the block at time of void. `void_reason` will be populated if the
- * void is created with a reason.
- *
- * ## Void
- *
- * When a set of credits is voided, the customer's balance automatically reflects this change and
- * adds an entry to the ledger indicating this event.
- *
- * ## Amendment
- *
- * When credits are added to a customer's balance as a result of a correction, this entry will be
- * added to the ledger to indicate the adjustment of credits.
- */
+/** @see [LedgerService.listByExternalId] */
 class CustomerCreditLedgerListByExternalIdPage
 private constructor(
-    private val ledgerService: LedgerService,
+    private val service: LedgerService,
     private val params: CustomerCreditLedgerListByExternalIdParams,
     private val response: CustomerCreditLedgerListByExternalIdPageResponse,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): CustomerCreditLedgerListByExternalIdPageResponse = response
-
     /**
      * Delegates to [CustomerCreditLedgerListByExternalIdPageResponse], but gracefully handles
      * missing data.
@@ -114,19 +36,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is CustomerCreditLedgerListByExternalIdPage && ledgerService == other.ledgerService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(ledgerService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "CustomerCreditLedgerListByExternalIdPage{ledgerService=$ledgerService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -148,20 +57,83 @@ private constructor(
         )
     }
 
-    fun getNextPage(): Optional<CustomerCreditLedgerListByExternalIdPage> {
-        return getNextPageParams().map { ledgerService.listByExternalId(it) }
-    }
+    fun getNextPage(): Optional<CustomerCreditLedgerListByExternalIdPage> =
+        getNextPageParams().map { service.listByExternalId(it) }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): CustomerCreditLedgerListByExternalIdParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): CustomerCreditLedgerListByExternalIdPageResponse = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            ledgerService: LedgerService,
-            params: CustomerCreditLedgerListByExternalIdParams,
-            response: CustomerCreditLedgerListByExternalIdPageResponse,
-        ) = CustomerCreditLedgerListByExternalIdPage(ledgerService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of
+         * [CustomerCreditLedgerListByExternalIdPage].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [CustomerCreditLedgerListByExternalIdPage]. */
+    class Builder internal constructor() {
+
+        private var service: LedgerService? = null
+        private var params: CustomerCreditLedgerListByExternalIdParams? = null
+        private var response: CustomerCreditLedgerListByExternalIdPageResponse? = null
+
+        @JvmSynthetic
+        internal fun from(
+            customerCreditLedgerListByExternalIdPage: CustomerCreditLedgerListByExternalIdPage
+        ) = apply {
+            service = customerCreditLedgerListByExternalIdPage.service
+            params = customerCreditLedgerListByExternalIdPage.params
+            response = customerCreditLedgerListByExternalIdPage.response
+        }
+
+        fun service(service: LedgerService) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: CustomerCreditLedgerListByExternalIdParams) = apply {
+            this.params = params
+        }
+
+        /** The response that this page was parsed from. */
+        fun response(response: CustomerCreditLedgerListByExternalIdPageResponse) = apply {
+            this.response = response
+        }
+
+        /**
+         * Returns an immutable instance of [CustomerCreditLedgerListByExternalIdPage].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): CustomerCreditLedgerListByExternalIdPage =
+            CustomerCreditLedgerListByExternalIdPage(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: CustomerCreditLedgerListByExternalIdPage) :
@@ -183,4 +155,17 @@ private constructor(
             return StreamSupport.stream(spliterator(), false)
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is CustomerCreditLedgerListByExternalIdPage && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() =
+        "CustomerCreditLedgerListByExternalIdPage{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditLedgerListByExternalIdPageAsync.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditLedgerListByExternalIdPageAsync.kt
index 99b78443d..ce9a3b860 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditLedgerListByExternalIdPageAsync.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditLedgerListByExternalIdPageAsync.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.async.customers.credits.LedgerServiceAsync
 import java.util.Objects
 import java.util.Optional
@@ -10,93 +11,14 @@ import java.util.concurrent.Executor
 import java.util.function.Predicate
 import kotlin.jvm.optionals.getOrNull
 
-/**
- * The credits ledger provides _auditing_ functionality over Orb's credits system with a list of
- * actions that have taken place to modify a customer's credit balance. This
- * [paginated endpoint](/api-reference/pagination) lists these entries, starting from the most
- * recent ledger entry.
- *
- * More details on using Orb's real-time credit feature are [here](/product-catalog/prepurchase).
- *
- * There are four major types of modifications to credit balance, detailed below.
- *
- * ## Increment
- *
- * Credits (which optionally expire on a future date) can be added via the API ([Add Ledger
- * Entry](create-ledger-entry)). The ledger entry for such an action will always contain the total
- * eligible starting and ending balance for the customer at the time the entry was added to the
- * ledger.
- *
- * ## Decrement
- *
- * Deductions can occur as a result of an API call to create a ledger entry (see
- * [Add Ledger Entry](create-ledger-entry)), or automatically as a result of incurring usage. Both
- * ledger entries present the `decrement` entry type.
- *
- * As usage for a customer is reported into Orb, credits may be deducted according to the customer's
- * plan configuration. An automated deduction of this type will result in a ledger entry, also with
- * a starting and ending balance. In order to provide better tracing capabilities for automatic
- * deductions, Orb always associates each automatic deduction with the `event_id` at the time of
- * ingestion, used to pinpoint _why_ credit deduction took place and to ensure that credits are
- * never deducted without an associated usage event.
- *
- * By default, Orb uses an algorithm that automatically deducts from the _soonest expiring credit
- * block_ first in order to ensure that all credits are utilized appropriately. As an example, if
- * trial credits with an expiration date of 2 weeks from now are present for a customer, they will
- * be used before any deductions take place from a non-expiring credit block.
- *
- * If there are multiple blocks with the same expiration date, Orb will deduct from the block with
- * the _lower cost basis_ first (e.g. trial credits with a $0 cost basis before paid credits with a
- * $5.00 cost basis).
- *
- * It's also possible for a single usage event's deduction to _span_ credit blocks. In this case,
- * Orb will deduct from the next block, ending at the credit block which consists of unexpiring
- * credits. Each of these deductions will lead to a _separate_ ledger entry, one per credit block
- * that is deducted from. By default, the customer's total credit balance in Orb can be negative as
- * a result of a decrement.
- *
- * ## Expiration change
- *
- * The expiry of credits can be changed as a result of the API (See
- * [Add Ledger Entry](create-ledger-entry)). This will create a ledger entry that specifies the
- * balance as well as the initial and target expiry dates.
- *
- * Note that for this entry type, `starting_balance` will equal `ending_balance`, and the `amount`
- * represents the balance transferred. The credit block linked to the ledger entry is the source
- * credit block from which there was an expiration change
- *
- * ## Credits expiry
- *
- * When a set of credits expire on pre-set expiration date, the customer's balance automatically
- * reflects this change and adds an entry to the ledger indicating this event. Note that credit
- * expiry should always happen close to a date boundary in the customer's timezone.
- *
- * ## Void initiated
- *
- * Credit blocks can be voided via the API. The `amount` on this entry corresponds to the number of
- * credits that were remaining in the block at time of void. `void_reason` will be populated if the
- * void is created with a reason.
- *
- * ## Void
- *
- * When a set of credits is voided, the customer's balance automatically reflects this change and
- * adds an entry to the ledger indicating this event.
- *
- * ## Amendment
- *
- * When credits are added to a customer's balance as a result of a correction, this entry will be
- * added to the ledger to indicate the adjustment of credits.
- */
+/** @see [LedgerServiceAsync.listByExternalId] */
 class CustomerCreditLedgerListByExternalIdPageAsync
 private constructor(
-    private val ledgerService: LedgerServiceAsync,
+    private val service: LedgerServiceAsync,
     private val params: CustomerCreditLedgerListByExternalIdParams,
     private val response: CustomerCreditLedgerListByExternalIdPageResponse,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): CustomerCreditLedgerListByExternalIdPageResponse = response
-
     /**
      * Delegates to [CustomerCreditLedgerListByExternalIdPageResponse], but gracefully handles
      * missing data.
@@ -115,19 +37,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is CustomerCreditLedgerListByExternalIdPageAsync && ledgerService == other.ledgerService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(ledgerService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "CustomerCreditLedgerListByExternalIdPageAsync{ledgerService=$ledgerService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -149,22 +58,86 @@ private constructor(
         )
     }
 
-    fun getNextPage(): CompletableFuture<Optional<CustomerCreditLedgerListByExternalIdPageAsync>> {
-        return getNextPageParams()
-            .map { ledgerService.listByExternalId(it).thenApply { Optional.of(it) } }
+    fun getNextPage(): CompletableFuture<Optional<CustomerCreditLedgerListByExternalIdPageAsync>> =
+        getNextPageParams()
+            .map { service.listByExternalId(it).thenApply { Optional.of(it) } }
             .orElseGet { CompletableFuture.completedFuture(Optional.empty()) }
-    }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): CustomerCreditLedgerListByExternalIdParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): CustomerCreditLedgerListByExternalIdPageResponse = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            ledgerService: LedgerServiceAsync,
-            params: CustomerCreditLedgerListByExternalIdParams,
-            response: CustomerCreditLedgerListByExternalIdPageResponse,
-        ) = CustomerCreditLedgerListByExternalIdPageAsync(ledgerService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of
+         * [CustomerCreditLedgerListByExternalIdPageAsync].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [CustomerCreditLedgerListByExternalIdPageAsync]. */
+    class Builder internal constructor() {
+
+        private var service: LedgerServiceAsync? = null
+        private var params: CustomerCreditLedgerListByExternalIdParams? = null
+        private var response: CustomerCreditLedgerListByExternalIdPageResponse? = null
+
+        @JvmSynthetic
+        internal fun from(
+            customerCreditLedgerListByExternalIdPageAsync:
+                CustomerCreditLedgerListByExternalIdPageAsync
+        ) = apply {
+            service = customerCreditLedgerListByExternalIdPageAsync.service
+            params = customerCreditLedgerListByExternalIdPageAsync.params
+            response = customerCreditLedgerListByExternalIdPageAsync.response
+        }
+
+        fun service(service: LedgerServiceAsync) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: CustomerCreditLedgerListByExternalIdParams) = apply {
+            this.params = params
+        }
+
+        /** The response that this page was parsed from. */
+        fun response(response: CustomerCreditLedgerListByExternalIdPageResponse) = apply {
+            this.response = response
+        }
+
+        /**
+         * Returns an immutable instance of [CustomerCreditLedgerListByExternalIdPageAsync].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): CustomerCreditLedgerListByExternalIdPageAsync =
+            CustomerCreditLedgerListByExternalIdPageAsync(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: CustomerCreditLedgerListByExternalIdPageAsync) {
@@ -197,4 +170,17 @@ private constructor(
             return forEach(values::add, executor).thenApply { values }
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is CustomerCreditLedgerListByExternalIdPageAsync && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() =
+        "CustomerCreditLedgerListByExternalIdPageAsync{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditLedgerListPage.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditLedgerListPage.kt
index 8e77f055c..b5b1fbb43 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditLedgerListPage.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditLedgerListPage.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.blocking.customers.credits.LedgerService
 import java.util.Objects
 import java.util.Optional
@@ -9,93 +10,14 @@ import java.util.stream.Stream
 import java.util.stream.StreamSupport
 import kotlin.jvm.optionals.getOrNull
 
-/**
- * The credits ledger provides _auditing_ functionality over Orb's credits system with a list of
- * actions that have taken place to modify a customer's credit balance. This
- * [paginated endpoint](/api-reference/pagination) lists these entries, starting from the most
- * recent ledger entry.
- *
- * More details on using Orb's real-time credit feature are [here](/product-catalog/prepurchase).
- *
- * There are four major types of modifications to credit balance, detailed below.
- *
- * ## Increment
- *
- * Credits (which optionally expire on a future date) can be added via the API ([Add Ledger
- * Entry](create-ledger-entry)). The ledger entry for such an action will always contain the total
- * eligible starting and ending balance for the customer at the time the entry was added to the
- * ledger.
- *
- * ## Decrement
- *
- * Deductions can occur as a result of an API call to create a ledger entry (see
- * [Add Ledger Entry](create-ledger-entry)), or automatically as a result of incurring usage. Both
- * ledger entries present the `decrement` entry type.
- *
- * As usage for a customer is reported into Orb, credits may be deducted according to the customer's
- * plan configuration. An automated deduction of this type will result in a ledger entry, also with
- * a starting and ending balance. In order to provide better tracing capabilities for automatic
- * deductions, Orb always associates each automatic deduction with the `event_id` at the time of
- * ingestion, used to pinpoint _why_ credit deduction took place and to ensure that credits are
- * never deducted without an associated usage event.
- *
- * By default, Orb uses an algorithm that automatically deducts from the _soonest expiring credit
- * block_ first in order to ensure that all credits are utilized appropriately. As an example, if
- * trial credits with an expiration date of 2 weeks from now are present for a customer, they will
- * be used before any deductions take place from a non-expiring credit block.
- *
- * If there are multiple blocks with the same expiration date, Orb will deduct from the block with
- * the _lower cost basis_ first (e.g. trial credits with a $0 cost basis before paid credits with a
- * $5.00 cost basis).
- *
- * It's also possible for a single usage event's deduction to _span_ credit blocks. In this case,
- * Orb will deduct from the next block, ending at the credit block which consists of unexpiring
- * credits. Each of these deductions will lead to a _separate_ ledger entry, one per credit block
- * that is deducted from. By default, the customer's total credit balance in Orb can be negative as
- * a result of a decrement.
- *
- * ## Expiration change
- *
- * The expiry of credits can be changed as a result of the API (See
- * [Add Ledger Entry](create-ledger-entry)). This will create a ledger entry that specifies the
- * balance as well as the initial and target expiry dates.
- *
- * Note that for this entry type, `starting_balance` will equal `ending_balance`, and the `amount`
- * represents the balance transferred. The credit block linked to the ledger entry is the source
- * credit block from which there was an expiration change
- *
- * ## Credits expiry
- *
- * When a set of credits expire on pre-set expiration date, the customer's balance automatically
- * reflects this change and adds an entry to the ledger indicating this event. Note that credit
- * expiry should always happen close to a date boundary in the customer's timezone.
- *
- * ## Void initiated
- *
- * Credit blocks can be voided via the API. The `amount` on this entry corresponds to the number of
- * credits that were remaining in the block at time of void. `void_reason` will be populated if the
- * void is created with a reason.
- *
- * ## Void
- *
- * When a set of credits is voided, the customer's balance automatically reflects this change and
- * adds an entry to the ledger indicating this event.
- *
- * ## Amendment
- *
- * When credits are added to a customer's balance as a result of a correction, this entry will be
- * added to the ledger to indicate the adjustment of credits.
- */
+/** @see [LedgerService.list] */
 class CustomerCreditLedgerListPage
 private constructor(
-    private val ledgerService: LedgerService,
+    private val service: LedgerService,
     private val params: CustomerCreditLedgerListParams,
     private val response: CustomerCreditLedgerListPageResponse,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): CustomerCreditLedgerListPageResponse = response
-
     /**
      * Delegates to [CustomerCreditLedgerListPageResponse], but gracefully handles missing data.
      *
@@ -112,19 +34,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is CustomerCreditLedgerListPage && ledgerService == other.ledgerService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(ledgerService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "CustomerCreditLedgerListPage{ledgerService=$ledgerService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -146,20 +55,78 @@ private constructor(
         )
     }
 
-    fun getNextPage(): Optional<CustomerCreditLedgerListPage> {
-        return getNextPageParams().map { ledgerService.list(it) }
-    }
+    fun getNextPage(): Optional<CustomerCreditLedgerListPage> =
+        getNextPageParams().map { service.list(it) }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): CustomerCreditLedgerListParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): CustomerCreditLedgerListPageResponse = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            ledgerService: LedgerService,
-            params: CustomerCreditLedgerListParams,
-            response: CustomerCreditLedgerListPageResponse,
-        ) = CustomerCreditLedgerListPage(ledgerService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of [CustomerCreditLedgerListPage].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [CustomerCreditLedgerListPage]. */
+    class Builder internal constructor() {
+
+        private var service: LedgerService? = null
+        private var params: CustomerCreditLedgerListParams? = null
+        private var response: CustomerCreditLedgerListPageResponse? = null
+
+        @JvmSynthetic
+        internal fun from(customerCreditLedgerListPage: CustomerCreditLedgerListPage) = apply {
+            service = customerCreditLedgerListPage.service
+            params = customerCreditLedgerListPage.params
+            response = customerCreditLedgerListPage.response
+        }
+
+        fun service(service: LedgerService) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: CustomerCreditLedgerListParams) = apply { this.params = params }
+
+        /** The response that this page was parsed from. */
+        fun response(response: CustomerCreditLedgerListPageResponse) = apply {
+            this.response = response
+        }
+
+        /**
+         * Returns an immutable instance of [CustomerCreditLedgerListPage].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): CustomerCreditLedgerListPage =
+            CustomerCreditLedgerListPage(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: CustomerCreditLedgerListPage) :
@@ -181,4 +148,17 @@ private constructor(
             return StreamSupport.stream(spliterator(), false)
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is CustomerCreditLedgerListPage && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() =
+        "CustomerCreditLedgerListPage{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditLedgerListPageAsync.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditLedgerListPageAsync.kt
index e3d105245..31bb87655 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditLedgerListPageAsync.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditLedgerListPageAsync.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.async.customers.credits.LedgerServiceAsync
 import java.util.Objects
 import java.util.Optional
@@ -10,93 +11,14 @@ import java.util.concurrent.Executor
 import java.util.function.Predicate
 import kotlin.jvm.optionals.getOrNull
 
-/**
- * The credits ledger provides _auditing_ functionality over Orb's credits system with a list of
- * actions that have taken place to modify a customer's credit balance. This
- * [paginated endpoint](/api-reference/pagination) lists these entries, starting from the most
- * recent ledger entry.
- *
- * More details on using Orb's real-time credit feature are [here](/product-catalog/prepurchase).
- *
- * There are four major types of modifications to credit balance, detailed below.
- *
- * ## Increment
- *
- * Credits (which optionally expire on a future date) can be added via the API ([Add Ledger
- * Entry](create-ledger-entry)). The ledger entry for such an action will always contain the total
- * eligible starting and ending balance for the customer at the time the entry was added to the
- * ledger.
- *
- * ## Decrement
- *
- * Deductions can occur as a result of an API call to create a ledger entry (see
- * [Add Ledger Entry](create-ledger-entry)), or automatically as a result of incurring usage. Both
- * ledger entries present the `decrement` entry type.
- *
- * As usage for a customer is reported into Orb, credits may be deducted according to the customer's
- * plan configuration. An automated deduction of this type will result in a ledger entry, also with
- * a starting and ending balance. In order to provide better tracing capabilities for automatic
- * deductions, Orb always associates each automatic deduction with the `event_id` at the time of
- * ingestion, used to pinpoint _why_ credit deduction took place and to ensure that credits are
- * never deducted without an associated usage event.
- *
- * By default, Orb uses an algorithm that automatically deducts from the _soonest expiring credit
- * block_ first in order to ensure that all credits are utilized appropriately. As an example, if
- * trial credits with an expiration date of 2 weeks from now are present for a customer, they will
- * be used before any deductions take place from a non-expiring credit block.
- *
- * If there are multiple blocks with the same expiration date, Orb will deduct from the block with
- * the _lower cost basis_ first (e.g. trial credits with a $0 cost basis before paid credits with a
- * $5.00 cost basis).
- *
- * It's also possible for a single usage event's deduction to _span_ credit blocks. In this case,
- * Orb will deduct from the next block, ending at the credit block which consists of unexpiring
- * credits. Each of these deductions will lead to a _separate_ ledger entry, one per credit block
- * that is deducted from. By default, the customer's total credit balance in Orb can be negative as
- * a result of a decrement.
- *
- * ## Expiration change
- *
- * The expiry of credits can be changed as a result of the API (See
- * [Add Ledger Entry](create-ledger-entry)). This will create a ledger entry that specifies the
- * balance as well as the initial and target expiry dates.
- *
- * Note that for this entry type, `starting_balance` will equal `ending_balance`, and the `amount`
- * represents the balance transferred. The credit block linked to the ledger entry is the source
- * credit block from which there was an expiration change
- *
- * ## Credits expiry
- *
- * When a set of credits expire on pre-set expiration date, the customer's balance automatically
- * reflects this change and adds an entry to the ledger indicating this event. Note that credit
- * expiry should always happen close to a date boundary in the customer's timezone.
- *
- * ## Void initiated
- *
- * Credit blocks can be voided via the API. The `amount` on this entry corresponds to the number of
- * credits that were remaining in the block at time of void. `void_reason` will be populated if the
- * void is created with a reason.
- *
- * ## Void
- *
- * When a set of credits is voided, the customer's balance automatically reflects this change and
- * adds an entry to the ledger indicating this event.
- *
- * ## Amendment
- *
- * When credits are added to a customer's balance as a result of a correction, this entry will be
- * added to the ledger to indicate the adjustment of credits.
- */
+/** @see [LedgerServiceAsync.list] */
 class CustomerCreditLedgerListPageAsync
 private constructor(
-    private val ledgerService: LedgerServiceAsync,
+    private val service: LedgerServiceAsync,
     private val params: CustomerCreditLedgerListParams,
     private val response: CustomerCreditLedgerListPageResponse,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): CustomerCreditLedgerListPageResponse = response
-
     /**
      * Delegates to [CustomerCreditLedgerListPageResponse], but gracefully handles missing data.
      *
@@ -113,19 +35,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is CustomerCreditLedgerListPageAsync && ledgerService == other.ledgerService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(ledgerService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "CustomerCreditLedgerListPageAsync{ledgerService=$ledgerService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -147,22 +56,82 @@ private constructor(
         )
     }
 
-    fun getNextPage(): CompletableFuture<Optional<CustomerCreditLedgerListPageAsync>> {
-        return getNextPageParams()
-            .map { ledgerService.list(it).thenApply { Optional.of(it) } }
+    fun getNextPage(): CompletableFuture<Optional<CustomerCreditLedgerListPageAsync>> =
+        getNextPageParams()
+            .map { service.list(it).thenApply { Optional.of(it) } }
             .orElseGet { CompletableFuture.completedFuture(Optional.empty()) }
-    }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): CustomerCreditLedgerListParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): CustomerCreditLedgerListPageResponse = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            ledgerService: LedgerServiceAsync,
-            params: CustomerCreditLedgerListParams,
-            response: CustomerCreditLedgerListPageResponse,
-        ) = CustomerCreditLedgerListPageAsync(ledgerService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of
+         * [CustomerCreditLedgerListPageAsync].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [CustomerCreditLedgerListPageAsync]. */
+    class Builder internal constructor() {
+
+        private var service: LedgerServiceAsync? = null
+        private var params: CustomerCreditLedgerListParams? = null
+        private var response: CustomerCreditLedgerListPageResponse? = null
+
+        @JvmSynthetic
+        internal fun from(customerCreditLedgerListPageAsync: CustomerCreditLedgerListPageAsync) =
+            apply {
+                service = customerCreditLedgerListPageAsync.service
+                params = customerCreditLedgerListPageAsync.params
+                response = customerCreditLedgerListPageAsync.response
+            }
+
+        fun service(service: LedgerServiceAsync) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: CustomerCreditLedgerListParams) = apply { this.params = params }
+
+        /** The response that this page was parsed from. */
+        fun response(response: CustomerCreditLedgerListPageResponse) = apply {
+            this.response = response
+        }
+
+        /**
+         * Returns an immutable instance of [CustomerCreditLedgerListPageAsync].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): CustomerCreditLedgerListPageAsync =
+            CustomerCreditLedgerListPageAsync(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: CustomerCreditLedgerListPageAsync) {
@@ -193,4 +162,17 @@ private constructor(
             return forEach(values::add, executor).thenApply { values }
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is CustomerCreditLedgerListPageAsync && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() =
+        "CustomerCreditLedgerListPageAsync{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditListByExternalIdPage.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditListByExternalIdPage.kt
index 99b3ed708..c63f6aa65 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditListByExternalIdPage.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditListByExternalIdPage.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.blocking.customers.CreditService
 import java.util.Objects
 import java.util.Optional
@@ -9,25 +10,14 @@ import java.util.stream.Stream
 import java.util.stream.StreamSupport
 import kotlin.jvm.optionals.getOrNull
 
-/**
- * Returns a paginated list of unexpired, non-zero credit blocks for a customer.
- *
- * If `include_all_blocks` is set to `true`, all credit blocks (including expired and depleted
- * blocks) will be included in the response.
- *
- * Note that `currency` defaults to credits if not specified. To use a real world currency, set
- * `currency` to an ISO 4217 string.
- */
+/** @see [CreditService.listByExternalId] */
 class CustomerCreditListByExternalIdPage
 private constructor(
-    private val creditsService: CreditService,
+    private val service: CreditService,
     private val params: CustomerCreditListByExternalIdParams,
     private val response: CustomerCreditListByExternalIdPageResponse,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): CustomerCreditListByExternalIdPageResponse = response
-
     /**
      * Delegates to [CustomerCreditListByExternalIdPageResponse], but gracefully handles missing
      * data.
@@ -46,19 +36,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is CustomerCreditListByExternalIdPage && creditsService == other.creditsService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(creditsService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "CustomerCreditListByExternalIdPage{creditsService=$creditsService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -80,20 +57,80 @@ private constructor(
         )
     }
 
-    fun getNextPage(): Optional<CustomerCreditListByExternalIdPage> {
-        return getNextPageParams().map { creditsService.listByExternalId(it) }
-    }
+    fun getNextPage(): Optional<CustomerCreditListByExternalIdPage> =
+        getNextPageParams().map { service.listByExternalId(it) }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): CustomerCreditListByExternalIdParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): CustomerCreditListByExternalIdPageResponse = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            creditsService: CreditService,
-            params: CustomerCreditListByExternalIdParams,
-            response: CustomerCreditListByExternalIdPageResponse,
-        ) = CustomerCreditListByExternalIdPage(creditsService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of
+         * [CustomerCreditListByExternalIdPage].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [CustomerCreditListByExternalIdPage]. */
+    class Builder internal constructor() {
+
+        private var service: CreditService? = null
+        private var params: CustomerCreditListByExternalIdParams? = null
+        private var response: CustomerCreditListByExternalIdPageResponse? = null
+
+        @JvmSynthetic
+        internal fun from(customerCreditListByExternalIdPage: CustomerCreditListByExternalIdPage) =
+            apply {
+                service = customerCreditListByExternalIdPage.service
+                params = customerCreditListByExternalIdPage.params
+                response = customerCreditListByExternalIdPage.response
+            }
+
+        fun service(service: CreditService) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: CustomerCreditListByExternalIdParams) = apply { this.params = params }
+
+        /** The response that this page was parsed from. */
+        fun response(response: CustomerCreditListByExternalIdPageResponse) = apply {
+            this.response = response
+        }
+
+        /**
+         * Returns an immutable instance of [CustomerCreditListByExternalIdPage].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): CustomerCreditListByExternalIdPage =
+            CustomerCreditListByExternalIdPage(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: CustomerCreditListByExternalIdPage) :
@@ -115,4 +152,17 @@ private constructor(
             return StreamSupport.stream(spliterator(), false)
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is CustomerCreditListByExternalIdPage && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() =
+        "CustomerCreditListByExternalIdPage{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditListByExternalIdPageAsync.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditListByExternalIdPageAsync.kt
index c039f2a62..a15138b23 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditListByExternalIdPageAsync.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditListByExternalIdPageAsync.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.async.customers.CreditServiceAsync
 import java.util.Objects
 import java.util.Optional
@@ -10,25 +11,14 @@ import java.util.concurrent.Executor
 import java.util.function.Predicate
 import kotlin.jvm.optionals.getOrNull
 
-/**
- * Returns a paginated list of unexpired, non-zero credit blocks for a customer.
- *
- * If `include_all_blocks` is set to `true`, all credit blocks (including expired and depleted
- * blocks) will be included in the response.
- *
- * Note that `currency` defaults to credits if not specified. To use a real world currency, set
- * `currency` to an ISO 4217 string.
- */
+/** @see [CreditServiceAsync.listByExternalId] */
 class CustomerCreditListByExternalIdPageAsync
 private constructor(
-    private val creditsService: CreditServiceAsync,
+    private val service: CreditServiceAsync,
     private val params: CustomerCreditListByExternalIdParams,
     private val response: CustomerCreditListByExternalIdPageResponse,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): CustomerCreditListByExternalIdPageResponse = response
-
     /**
      * Delegates to [CustomerCreditListByExternalIdPageResponse], but gracefully handles missing
      * data.
@@ -47,19 +37,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is CustomerCreditListByExternalIdPageAsync && creditsService == other.creditsService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(creditsService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "CustomerCreditListByExternalIdPageAsync{creditsService=$creditsService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -81,22 +58,83 @@ private constructor(
         )
     }
 
-    fun getNextPage(): CompletableFuture<Optional<CustomerCreditListByExternalIdPageAsync>> {
-        return getNextPageParams()
-            .map { creditsService.listByExternalId(it).thenApply { Optional.of(it) } }
+    fun getNextPage(): CompletableFuture<Optional<CustomerCreditListByExternalIdPageAsync>> =
+        getNextPageParams()
+            .map { service.listByExternalId(it).thenApply { Optional.of(it) } }
             .orElseGet { CompletableFuture.completedFuture(Optional.empty()) }
-    }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): CustomerCreditListByExternalIdParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): CustomerCreditListByExternalIdPageResponse = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            creditsService: CreditServiceAsync,
-            params: CustomerCreditListByExternalIdParams,
-            response: CustomerCreditListByExternalIdPageResponse,
-        ) = CustomerCreditListByExternalIdPageAsync(creditsService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of
+         * [CustomerCreditListByExternalIdPageAsync].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [CustomerCreditListByExternalIdPageAsync]. */
+    class Builder internal constructor() {
+
+        private var service: CreditServiceAsync? = null
+        private var params: CustomerCreditListByExternalIdParams? = null
+        private var response: CustomerCreditListByExternalIdPageResponse? = null
+
+        @JvmSynthetic
+        internal fun from(
+            customerCreditListByExternalIdPageAsync: CustomerCreditListByExternalIdPageAsync
+        ) = apply {
+            service = customerCreditListByExternalIdPageAsync.service
+            params = customerCreditListByExternalIdPageAsync.params
+            response = customerCreditListByExternalIdPageAsync.response
+        }
+
+        fun service(service: CreditServiceAsync) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: CustomerCreditListByExternalIdParams) = apply { this.params = params }
+
+        /** The response that this page was parsed from. */
+        fun response(response: CustomerCreditListByExternalIdPageResponse) = apply {
+            this.response = response
+        }
+
+        /**
+         * Returns an immutable instance of [CustomerCreditListByExternalIdPageAsync].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): CustomerCreditListByExternalIdPageAsync =
+            CustomerCreditListByExternalIdPageAsync(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: CustomerCreditListByExternalIdPageAsync) {
@@ -129,4 +167,17 @@ private constructor(
             return forEach(values::add, executor).thenApply { values }
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is CustomerCreditListByExternalIdPageAsync && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() =
+        "CustomerCreditListByExternalIdPageAsync{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditListPage.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditListPage.kt
index 0ded908e9..df86a0a8e 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditListPage.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditListPage.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.blocking.customers.CreditService
 import java.util.Objects
 import java.util.Optional
@@ -9,25 +10,14 @@ import java.util.stream.Stream
 import java.util.stream.StreamSupport
 import kotlin.jvm.optionals.getOrNull
 
-/**
- * Returns a paginated list of unexpired, non-zero credit blocks for a customer.
- *
- * If `include_all_blocks` is set to `true`, all credit blocks (including expired and depleted
- * blocks) will be included in the response.
- *
- * Note that `currency` defaults to credits if not specified. To use a real world currency, set
- * `currency` to an ISO 4217 string.
- */
+/** @see [CreditService.list] */
 class CustomerCreditListPage
 private constructor(
-    private val creditsService: CreditService,
+    private val service: CreditService,
     private val params: CustomerCreditListParams,
     private val response: CustomerCreditListPageResponse,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): CustomerCreditListPageResponse = response
-
     /**
      * Delegates to [CustomerCreditListPageResponse], but gracefully handles missing data.
      *
@@ -44,19 +34,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is CustomerCreditListPage && creditsService == other.creditsService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(creditsService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "CustomerCreditListPage{creditsService=$creditsService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -78,20 +55,76 @@ private constructor(
         )
     }
 
-    fun getNextPage(): Optional<CustomerCreditListPage> {
-        return getNextPageParams().map { creditsService.list(it) }
-    }
+    fun getNextPage(): Optional<CustomerCreditListPage> =
+        getNextPageParams().map { service.list(it) }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): CustomerCreditListParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): CustomerCreditListPageResponse = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            creditsService: CreditService,
-            params: CustomerCreditListParams,
-            response: CustomerCreditListPageResponse,
-        ) = CustomerCreditListPage(creditsService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of [CustomerCreditListPage].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [CustomerCreditListPage]. */
+    class Builder internal constructor() {
+
+        private var service: CreditService? = null
+        private var params: CustomerCreditListParams? = null
+        private var response: CustomerCreditListPageResponse? = null
+
+        @JvmSynthetic
+        internal fun from(customerCreditListPage: CustomerCreditListPage) = apply {
+            service = customerCreditListPage.service
+            params = customerCreditListPage.params
+            response = customerCreditListPage.response
+        }
+
+        fun service(service: CreditService) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: CustomerCreditListParams) = apply { this.params = params }
+
+        /** The response that this page was parsed from. */
+        fun response(response: CustomerCreditListPageResponse) = apply { this.response = response }
+
+        /**
+         * Returns an immutable instance of [CustomerCreditListPage].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): CustomerCreditListPage =
+            CustomerCreditListPage(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: CustomerCreditListPage) :
@@ -113,4 +146,17 @@ private constructor(
             return StreamSupport.stream(spliterator(), false)
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is CustomerCreditListPage && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() =
+        "CustomerCreditListPage{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditListPageAsync.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditListPageAsync.kt
index 4115333d7..03272689b 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditListPageAsync.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditListPageAsync.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.async.customers.CreditServiceAsync
 import java.util.Objects
 import java.util.Optional
@@ -10,25 +11,14 @@ import java.util.concurrent.Executor
 import java.util.function.Predicate
 import kotlin.jvm.optionals.getOrNull
 
-/**
- * Returns a paginated list of unexpired, non-zero credit blocks for a customer.
- *
- * If `include_all_blocks` is set to `true`, all credit blocks (including expired and depleted
- * blocks) will be included in the response.
- *
- * Note that `currency` defaults to credits if not specified. To use a real world currency, set
- * `currency` to an ISO 4217 string.
- */
+/** @see [CreditServiceAsync.list] */
 class CustomerCreditListPageAsync
 private constructor(
-    private val creditsService: CreditServiceAsync,
+    private val service: CreditServiceAsync,
     private val params: CustomerCreditListParams,
     private val response: CustomerCreditListPageResponse,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): CustomerCreditListPageResponse = response
-
     /**
      * Delegates to [CustomerCreditListPageResponse], but gracefully handles missing data.
      *
@@ -45,19 +35,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is CustomerCreditListPageAsync && creditsService == other.creditsService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(creditsService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "CustomerCreditListPageAsync{creditsService=$creditsService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -79,22 +56,78 @@ private constructor(
         )
     }
 
-    fun getNextPage(): CompletableFuture<Optional<CustomerCreditListPageAsync>> {
-        return getNextPageParams()
-            .map { creditsService.list(it).thenApply { Optional.of(it) } }
+    fun getNextPage(): CompletableFuture<Optional<CustomerCreditListPageAsync>> =
+        getNextPageParams()
+            .map { service.list(it).thenApply { Optional.of(it) } }
             .orElseGet { CompletableFuture.completedFuture(Optional.empty()) }
-    }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): CustomerCreditListParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): CustomerCreditListPageResponse = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            creditsService: CreditServiceAsync,
-            params: CustomerCreditListParams,
-            response: CustomerCreditListPageResponse,
-        ) = CustomerCreditListPageAsync(creditsService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of [CustomerCreditListPageAsync].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [CustomerCreditListPageAsync]. */
+    class Builder internal constructor() {
+
+        private var service: CreditServiceAsync? = null
+        private var params: CustomerCreditListParams? = null
+        private var response: CustomerCreditListPageResponse? = null
+
+        @JvmSynthetic
+        internal fun from(customerCreditListPageAsync: CustomerCreditListPageAsync) = apply {
+            service = customerCreditListPageAsync.service
+            params = customerCreditListPageAsync.params
+            response = customerCreditListPageAsync.response
+        }
+
+        fun service(service: CreditServiceAsync) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: CustomerCreditListParams) = apply { this.params = params }
+
+        /** The response that this page was parsed from. */
+        fun response(response: CustomerCreditListPageResponse) = apply { this.response = response }
+
+        /**
+         * Returns an immutable instance of [CustomerCreditListPageAsync].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): CustomerCreditListPageAsync =
+            CustomerCreditListPageAsync(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: CustomerCreditListPageAsync) {
@@ -125,4 +158,17 @@ private constructor(
             return forEach(values::add, executor).thenApply { values }
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is CustomerCreditListPageAsync && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() =
+        "CustomerCreditListPageAsync{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditTopUpListByExternalIdPage.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditTopUpListByExternalIdPage.kt
index 60fb71494..7e1662ead 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditTopUpListByExternalIdPage.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditTopUpListByExternalIdPage.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.blocking.customers.credits.TopUpService
 import java.util.Objects
 import java.util.Optional
@@ -9,17 +10,14 @@ import java.util.stream.Stream
 import java.util.stream.StreamSupport
 import kotlin.jvm.optionals.getOrNull
 
-/** List top-ups by external ID */
+/** @see [TopUpService.listByExternalId] */
 class CustomerCreditTopUpListByExternalIdPage
 private constructor(
-    private val topUpsService: TopUpService,
+    private val service: TopUpService,
     private val params: CustomerCreditTopUpListByExternalIdParams,
     private val response: CustomerCreditTopUpListByExternalIdPageResponse,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): CustomerCreditTopUpListByExternalIdPageResponse = response
-
     /**
      * Delegates to [CustomerCreditTopUpListByExternalIdPageResponse], but gracefully handles
      * missing data.
@@ -38,19 +36,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is CustomerCreditTopUpListByExternalIdPage && topUpsService == other.topUpsService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(topUpsService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "CustomerCreditTopUpListByExternalIdPage{topUpsService=$topUpsService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -72,20 +57,83 @@ private constructor(
         )
     }
 
-    fun getNextPage(): Optional<CustomerCreditTopUpListByExternalIdPage> {
-        return getNextPageParams().map { topUpsService.listByExternalId(it) }
-    }
+    fun getNextPage(): Optional<CustomerCreditTopUpListByExternalIdPage> =
+        getNextPageParams().map { service.listByExternalId(it) }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): CustomerCreditTopUpListByExternalIdParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): CustomerCreditTopUpListByExternalIdPageResponse = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            topUpsService: TopUpService,
-            params: CustomerCreditTopUpListByExternalIdParams,
-            response: CustomerCreditTopUpListByExternalIdPageResponse,
-        ) = CustomerCreditTopUpListByExternalIdPage(topUpsService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of
+         * [CustomerCreditTopUpListByExternalIdPage].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [CustomerCreditTopUpListByExternalIdPage]. */
+    class Builder internal constructor() {
+
+        private var service: TopUpService? = null
+        private var params: CustomerCreditTopUpListByExternalIdParams? = null
+        private var response: CustomerCreditTopUpListByExternalIdPageResponse? = null
+
+        @JvmSynthetic
+        internal fun from(
+            customerCreditTopUpListByExternalIdPage: CustomerCreditTopUpListByExternalIdPage
+        ) = apply {
+            service = customerCreditTopUpListByExternalIdPage.service
+            params = customerCreditTopUpListByExternalIdPage.params
+            response = customerCreditTopUpListByExternalIdPage.response
+        }
+
+        fun service(service: TopUpService) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: CustomerCreditTopUpListByExternalIdParams) = apply {
+            this.params = params
+        }
+
+        /** The response that this page was parsed from. */
+        fun response(response: CustomerCreditTopUpListByExternalIdPageResponse) = apply {
+            this.response = response
+        }
+
+        /**
+         * Returns an immutable instance of [CustomerCreditTopUpListByExternalIdPage].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): CustomerCreditTopUpListByExternalIdPage =
+            CustomerCreditTopUpListByExternalIdPage(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: CustomerCreditTopUpListByExternalIdPage) :
@@ -107,4 +155,17 @@ private constructor(
             return StreamSupport.stream(spliterator(), false)
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is CustomerCreditTopUpListByExternalIdPage && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() =
+        "CustomerCreditTopUpListByExternalIdPage{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditTopUpListByExternalIdPageAsync.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditTopUpListByExternalIdPageAsync.kt
index dadcc6965..7ea10578a 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditTopUpListByExternalIdPageAsync.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditTopUpListByExternalIdPageAsync.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.async.customers.credits.TopUpServiceAsync
 import java.util.Objects
 import java.util.Optional
@@ -10,17 +11,14 @@ import java.util.concurrent.Executor
 import java.util.function.Predicate
 import kotlin.jvm.optionals.getOrNull
 
-/** List top-ups by external ID */
+/** @see [TopUpServiceAsync.listByExternalId] */
 class CustomerCreditTopUpListByExternalIdPageAsync
 private constructor(
-    private val topUpsService: TopUpServiceAsync,
+    private val service: TopUpServiceAsync,
     private val params: CustomerCreditTopUpListByExternalIdParams,
     private val response: CustomerCreditTopUpListByExternalIdPageResponse,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): CustomerCreditTopUpListByExternalIdPageResponse = response
-
     /**
      * Delegates to [CustomerCreditTopUpListByExternalIdPageResponse], but gracefully handles
      * missing data.
@@ -39,19 +37,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is CustomerCreditTopUpListByExternalIdPageAsync && topUpsService == other.topUpsService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(topUpsService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "CustomerCreditTopUpListByExternalIdPageAsync{topUpsService=$topUpsService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -73,22 +58,86 @@ private constructor(
         )
     }
 
-    fun getNextPage(): CompletableFuture<Optional<CustomerCreditTopUpListByExternalIdPageAsync>> {
-        return getNextPageParams()
-            .map { topUpsService.listByExternalId(it).thenApply { Optional.of(it) } }
+    fun getNextPage(): CompletableFuture<Optional<CustomerCreditTopUpListByExternalIdPageAsync>> =
+        getNextPageParams()
+            .map { service.listByExternalId(it).thenApply { Optional.of(it) } }
             .orElseGet { CompletableFuture.completedFuture(Optional.empty()) }
-    }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): CustomerCreditTopUpListByExternalIdParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): CustomerCreditTopUpListByExternalIdPageResponse = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            topUpsService: TopUpServiceAsync,
-            params: CustomerCreditTopUpListByExternalIdParams,
-            response: CustomerCreditTopUpListByExternalIdPageResponse,
-        ) = CustomerCreditTopUpListByExternalIdPageAsync(topUpsService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of
+         * [CustomerCreditTopUpListByExternalIdPageAsync].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [CustomerCreditTopUpListByExternalIdPageAsync]. */
+    class Builder internal constructor() {
+
+        private var service: TopUpServiceAsync? = null
+        private var params: CustomerCreditTopUpListByExternalIdParams? = null
+        private var response: CustomerCreditTopUpListByExternalIdPageResponse? = null
+
+        @JvmSynthetic
+        internal fun from(
+            customerCreditTopUpListByExternalIdPageAsync:
+                CustomerCreditTopUpListByExternalIdPageAsync
+        ) = apply {
+            service = customerCreditTopUpListByExternalIdPageAsync.service
+            params = customerCreditTopUpListByExternalIdPageAsync.params
+            response = customerCreditTopUpListByExternalIdPageAsync.response
+        }
+
+        fun service(service: TopUpServiceAsync) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: CustomerCreditTopUpListByExternalIdParams) = apply {
+            this.params = params
+        }
+
+        /** The response that this page was parsed from. */
+        fun response(response: CustomerCreditTopUpListByExternalIdPageResponse) = apply {
+            this.response = response
+        }
+
+        /**
+         * Returns an immutable instance of [CustomerCreditTopUpListByExternalIdPageAsync].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): CustomerCreditTopUpListByExternalIdPageAsync =
+            CustomerCreditTopUpListByExternalIdPageAsync(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: CustomerCreditTopUpListByExternalIdPageAsync) {
@@ -121,4 +170,17 @@ private constructor(
             return forEach(values::add, executor).thenApply { values }
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is CustomerCreditTopUpListByExternalIdPageAsync && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() =
+        "CustomerCreditTopUpListByExternalIdPageAsync{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditTopUpListPage.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditTopUpListPage.kt
index a75a867c3..8b8931477 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditTopUpListPage.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditTopUpListPage.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.blocking.customers.credits.TopUpService
 import java.util.Objects
 import java.util.Optional
@@ -9,17 +10,14 @@ import java.util.stream.Stream
 import java.util.stream.StreamSupport
 import kotlin.jvm.optionals.getOrNull
 
-/** List top-ups */
+/** @see [TopUpService.list] */
 class CustomerCreditTopUpListPage
 private constructor(
-    private val topUpsService: TopUpService,
+    private val service: TopUpService,
     private val params: CustomerCreditTopUpListParams,
     private val response: CustomerCreditTopUpListPageResponse,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): CustomerCreditTopUpListPageResponse = response
-
     /**
      * Delegates to [CustomerCreditTopUpListPageResponse], but gracefully handles missing data.
      *
@@ -36,19 +34,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is CustomerCreditTopUpListPage && topUpsService == other.topUpsService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(topUpsService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "CustomerCreditTopUpListPage{topUpsService=$topUpsService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -70,20 +55,78 @@ private constructor(
         )
     }
 
-    fun getNextPage(): Optional<CustomerCreditTopUpListPage> {
-        return getNextPageParams().map { topUpsService.list(it) }
-    }
+    fun getNextPage(): Optional<CustomerCreditTopUpListPage> =
+        getNextPageParams().map { service.list(it) }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): CustomerCreditTopUpListParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): CustomerCreditTopUpListPageResponse = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            topUpsService: TopUpService,
-            params: CustomerCreditTopUpListParams,
-            response: CustomerCreditTopUpListPageResponse,
-        ) = CustomerCreditTopUpListPage(topUpsService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of [CustomerCreditTopUpListPage].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [CustomerCreditTopUpListPage]. */
+    class Builder internal constructor() {
+
+        private var service: TopUpService? = null
+        private var params: CustomerCreditTopUpListParams? = null
+        private var response: CustomerCreditTopUpListPageResponse? = null
+
+        @JvmSynthetic
+        internal fun from(customerCreditTopUpListPage: CustomerCreditTopUpListPage) = apply {
+            service = customerCreditTopUpListPage.service
+            params = customerCreditTopUpListPage.params
+            response = customerCreditTopUpListPage.response
+        }
+
+        fun service(service: TopUpService) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: CustomerCreditTopUpListParams) = apply { this.params = params }
+
+        /** The response that this page was parsed from. */
+        fun response(response: CustomerCreditTopUpListPageResponse) = apply {
+            this.response = response
+        }
+
+        /**
+         * Returns an immutable instance of [CustomerCreditTopUpListPage].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): CustomerCreditTopUpListPage =
+            CustomerCreditTopUpListPage(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: CustomerCreditTopUpListPage) :
@@ -105,4 +148,17 @@ private constructor(
             return StreamSupport.stream(spliterator(), false)
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is CustomerCreditTopUpListPage && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() =
+        "CustomerCreditTopUpListPage{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditTopUpListPageAsync.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditTopUpListPageAsync.kt
index 3602bce09..311e993a7 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditTopUpListPageAsync.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerCreditTopUpListPageAsync.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.async.customers.credits.TopUpServiceAsync
 import java.util.Objects
 import java.util.Optional
@@ -10,17 +11,14 @@ import java.util.concurrent.Executor
 import java.util.function.Predicate
 import kotlin.jvm.optionals.getOrNull
 
-/** List top-ups */
+/** @see [TopUpServiceAsync.list] */
 class CustomerCreditTopUpListPageAsync
 private constructor(
-    private val topUpsService: TopUpServiceAsync,
+    private val service: TopUpServiceAsync,
     private val params: CustomerCreditTopUpListParams,
     private val response: CustomerCreditTopUpListPageResponse,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): CustomerCreditTopUpListPageResponse = response
-
     /**
      * Delegates to [CustomerCreditTopUpListPageResponse], but gracefully handles missing data.
      *
@@ -37,19 +35,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is CustomerCreditTopUpListPageAsync && topUpsService == other.topUpsService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(topUpsService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "CustomerCreditTopUpListPageAsync{topUpsService=$topUpsService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -71,22 +56,82 @@ private constructor(
         )
     }
 
-    fun getNextPage(): CompletableFuture<Optional<CustomerCreditTopUpListPageAsync>> {
-        return getNextPageParams()
-            .map { topUpsService.list(it).thenApply { Optional.of(it) } }
+    fun getNextPage(): CompletableFuture<Optional<CustomerCreditTopUpListPageAsync>> =
+        getNextPageParams()
+            .map { service.list(it).thenApply { Optional.of(it) } }
             .orElseGet { CompletableFuture.completedFuture(Optional.empty()) }
-    }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): CustomerCreditTopUpListParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): CustomerCreditTopUpListPageResponse = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            topUpsService: TopUpServiceAsync,
-            params: CustomerCreditTopUpListParams,
-            response: CustomerCreditTopUpListPageResponse,
-        ) = CustomerCreditTopUpListPageAsync(topUpsService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of
+         * [CustomerCreditTopUpListPageAsync].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [CustomerCreditTopUpListPageAsync]. */
+    class Builder internal constructor() {
+
+        private var service: TopUpServiceAsync? = null
+        private var params: CustomerCreditTopUpListParams? = null
+        private var response: CustomerCreditTopUpListPageResponse? = null
+
+        @JvmSynthetic
+        internal fun from(customerCreditTopUpListPageAsync: CustomerCreditTopUpListPageAsync) =
+            apply {
+                service = customerCreditTopUpListPageAsync.service
+                params = customerCreditTopUpListPageAsync.params
+                response = customerCreditTopUpListPageAsync.response
+            }
+
+        fun service(service: TopUpServiceAsync) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: CustomerCreditTopUpListParams) = apply { this.params = params }
+
+        /** The response that this page was parsed from. */
+        fun response(response: CustomerCreditTopUpListPageResponse) = apply {
+            this.response = response
+        }
+
+        /**
+         * Returns an immutable instance of [CustomerCreditTopUpListPageAsync].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): CustomerCreditTopUpListPageAsync =
+            CustomerCreditTopUpListPageAsync(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: CustomerCreditTopUpListPageAsync) {
@@ -117,4 +162,17 @@ private constructor(
             return forEach(values::add, executor).thenApply { values }
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is CustomerCreditTopUpListPageAsync && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() =
+        "CustomerCreditTopUpListPageAsync{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerListPage.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerListPage.kt
index ba2dacdd6..4f51a3baa 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerListPage.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerListPage.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.blocking.CustomerService
 import java.util.Objects
 import java.util.Optional
@@ -9,23 +10,14 @@ import java.util.stream.Stream
 import java.util.stream.StreamSupport
 import kotlin.jvm.optionals.getOrNull
 
-/**
- * This endpoint returns a list of all customers for an account. The list of customers is ordered
- * starting from the most recently created customer. This endpoint follows Orb's
- * [standardized pagination format](/api-reference/pagination).
- *
- * See [Customer](/core-concepts##customer) for an overview of the customer model.
- */
+/** @see [CustomerService.list] */
 class CustomerListPage
 private constructor(
-    private val customersService: CustomerService,
+    private val service: CustomerService,
     private val params: CustomerListParams,
     private val response: CustomerListPageResponse,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): CustomerListPageResponse = response
-
     /**
      * Delegates to [CustomerListPageResponse], but gracefully handles missing data.
      *
@@ -41,19 +33,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is CustomerListPage && customersService == other.customersService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(customersService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "CustomerListPage{customersService=$customersService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -75,20 +54,75 @@ private constructor(
         )
     }
 
-    fun getNextPage(): Optional<CustomerListPage> {
-        return getNextPageParams().map { customersService.list(it) }
-    }
+    fun getNextPage(): Optional<CustomerListPage> = getNextPageParams().map { service.list(it) }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): CustomerListParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): CustomerListPageResponse = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            customersService: CustomerService,
-            params: CustomerListParams,
-            response: CustomerListPageResponse,
-        ) = CustomerListPage(customersService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of [CustomerListPage].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [CustomerListPage]. */
+    class Builder internal constructor() {
+
+        private var service: CustomerService? = null
+        private var params: CustomerListParams? = null
+        private var response: CustomerListPageResponse? = null
+
+        @JvmSynthetic
+        internal fun from(customerListPage: CustomerListPage) = apply {
+            service = customerListPage.service
+            params = customerListPage.params
+            response = customerListPage.response
+        }
+
+        fun service(service: CustomerService) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: CustomerListParams) = apply { this.params = params }
+
+        /** The response that this page was parsed from. */
+        fun response(response: CustomerListPageResponse) = apply { this.response = response }
+
+        /**
+         * Returns an immutable instance of [CustomerListPage].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): CustomerListPage =
+            CustomerListPage(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: CustomerListPage) : Iterable<Customer> {
@@ -109,4 +143,17 @@ private constructor(
             return StreamSupport.stream(spliterator(), false)
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is CustomerListPage && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() =
+        "CustomerListPage{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerListPageAsync.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerListPageAsync.kt
index 706183379..849280469 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerListPageAsync.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/CustomerListPageAsync.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.async.CustomerServiceAsync
 import java.util.Objects
 import java.util.Optional
@@ -10,23 +11,14 @@ import java.util.concurrent.Executor
 import java.util.function.Predicate
 import kotlin.jvm.optionals.getOrNull
 
-/**
- * This endpoint returns a list of all customers for an account. The list of customers is ordered
- * starting from the most recently created customer. This endpoint follows Orb's
- * [standardized pagination format](/api-reference/pagination).
- *
- * See [Customer](/core-concepts##customer) for an overview of the customer model.
- */
+/** @see [CustomerServiceAsync.list] */
 class CustomerListPageAsync
 private constructor(
-    private val customersService: CustomerServiceAsync,
+    private val service: CustomerServiceAsync,
     private val params: CustomerListParams,
     private val response: CustomerListPageResponse,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): CustomerListPageResponse = response
-
     /**
      * Delegates to [CustomerListPageResponse], but gracefully handles missing data.
      *
@@ -42,19 +34,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is CustomerListPageAsync && customersService == other.customersService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(customersService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "CustomerListPageAsync{customersService=$customersService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -76,22 +55,78 @@ private constructor(
         )
     }
 
-    fun getNextPage(): CompletableFuture<Optional<CustomerListPageAsync>> {
-        return getNextPageParams()
-            .map { customersService.list(it).thenApply { Optional.of(it) } }
+    fun getNextPage(): CompletableFuture<Optional<CustomerListPageAsync>> =
+        getNextPageParams()
+            .map { service.list(it).thenApply { Optional.of(it) } }
             .orElseGet { CompletableFuture.completedFuture(Optional.empty()) }
-    }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): CustomerListParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): CustomerListPageResponse = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            customersService: CustomerServiceAsync,
-            params: CustomerListParams,
-            response: CustomerListPageResponse,
-        ) = CustomerListPageAsync(customersService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of [CustomerListPageAsync].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [CustomerListPageAsync]. */
+    class Builder internal constructor() {
+
+        private var service: CustomerServiceAsync? = null
+        private var params: CustomerListParams? = null
+        private var response: CustomerListPageResponse? = null
+
+        @JvmSynthetic
+        internal fun from(customerListPageAsync: CustomerListPageAsync) = apply {
+            service = customerListPageAsync.service
+            params = customerListPageAsync.params
+            response = customerListPageAsync.response
+        }
+
+        fun service(service: CustomerServiceAsync) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: CustomerListParams) = apply { this.params = params }
+
+        /** The response that this page was parsed from. */
+        fun response(response: CustomerListPageResponse) = apply { this.response = response }
+
+        /**
+         * Returns an immutable instance of [CustomerListPageAsync].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): CustomerListPageAsync =
+            CustomerListPageAsync(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: CustomerListPageAsync) {
@@ -119,4 +154,17 @@ private constructor(
             return forEach(values::add, executor).thenApply { values }
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is CustomerListPageAsync && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() =
+        "CustomerListPageAsync{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/DimensionalPriceGroupListPage.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/DimensionalPriceGroupListPage.kt
index b15fd5041..7d685ba51 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/DimensionalPriceGroupListPage.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/DimensionalPriceGroupListPage.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.blocking.DimensionalPriceGroupService
 import java.util.Objects
 import java.util.Optional
@@ -9,17 +10,14 @@ import java.util.stream.Stream
 import java.util.stream.StreamSupport
 import kotlin.jvm.optionals.getOrNull
 
-/** List dimensional price groups */
+/** @see [DimensionalPriceGroupService.list] */
 class DimensionalPriceGroupListPage
 private constructor(
-    private val dimensionalPriceGroupsService: DimensionalPriceGroupService,
+    private val service: DimensionalPriceGroupService,
     private val params: DimensionalPriceGroupListParams,
     private val response: DimensionalPriceGroups,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): DimensionalPriceGroups = response
-
     /**
      * Delegates to [DimensionalPriceGroups], but gracefully handles missing data.
      *
@@ -36,19 +34,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is DimensionalPriceGroupListPage && dimensionalPriceGroupsService == other.dimensionalPriceGroupsService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(dimensionalPriceGroupsService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "DimensionalPriceGroupListPage{dimensionalPriceGroupsService=$dimensionalPriceGroupsService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -70,20 +55,77 @@ private constructor(
         )
     }
 
-    fun getNextPage(): Optional<DimensionalPriceGroupListPage> {
-        return getNextPageParams().map { dimensionalPriceGroupsService.list(it) }
-    }
+    fun getNextPage(): Optional<DimensionalPriceGroupListPage> =
+        getNextPageParams().map { service.list(it) }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): DimensionalPriceGroupListParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): DimensionalPriceGroups = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            dimensionalPriceGroupsService: DimensionalPriceGroupService,
-            params: DimensionalPriceGroupListParams,
-            response: DimensionalPriceGroups,
-        ) = DimensionalPriceGroupListPage(dimensionalPriceGroupsService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of
+         * [DimensionalPriceGroupListPage].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [DimensionalPriceGroupListPage]. */
+    class Builder internal constructor() {
+
+        private var service: DimensionalPriceGroupService? = null
+        private var params: DimensionalPriceGroupListParams? = null
+        private var response: DimensionalPriceGroups? = null
+
+        @JvmSynthetic
+        internal fun from(dimensionalPriceGroupListPage: DimensionalPriceGroupListPage) = apply {
+            service = dimensionalPriceGroupListPage.service
+            params = dimensionalPriceGroupListPage.params
+            response = dimensionalPriceGroupListPage.response
+        }
+
+        fun service(service: DimensionalPriceGroupService) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: DimensionalPriceGroupListParams) = apply { this.params = params }
+
+        /** The response that this page was parsed from. */
+        fun response(response: DimensionalPriceGroups) = apply { this.response = response }
+
+        /**
+         * Returns an immutable instance of [DimensionalPriceGroupListPage].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): DimensionalPriceGroupListPage =
+            DimensionalPriceGroupListPage(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: DimensionalPriceGroupListPage) :
@@ -105,4 +147,17 @@ private constructor(
             return StreamSupport.stream(spliterator(), false)
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is DimensionalPriceGroupListPage && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() =
+        "DimensionalPriceGroupListPage{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/DimensionalPriceGroupListPageAsync.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/DimensionalPriceGroupListPageAsync.kt
index 4e36fe97e..a823786c9 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/DimensionalPriceGroupListPageAsync.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/DimensionalPriceGroupListPageAsync.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.async.DimensionalPriceGroupServiceAsync
 import java.util.Objects
 import java.util.Optional
@@ -10,17 +11,14 @@ import java.util.concurrent.Executor
 import java.util.function.Predicate
 import kotlin.jvm.optionals.getOrNull
 
-/** List dimensional price groups */
+/** @see [DimensionalPriceGroupServiceAsync.list] */
 class DimensionalPriceGroupListPageAsync
 private constructor(
-    private val dimensionalPriceGroupsService: DimensionalPriceGroupServiceAsync,
+    private val service: DimensionalPriceGroupServiceAsync,
     private val params: DimensionalPriceGroupListParams,
     private val response: DimensionalPriceGroups,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): DimensionalPriceGroups = response
-
     /**
      * Delegates to [DimensionalPriceGroups], but gracefully handles missing data.
      *
@@ -37,19 +35,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is DimensionalPriceGroupListPageAsync && dimensionalPriceGroupsService == other.dimensionalPriceGroupsService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(dimensionalPriceGroupsService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "DimensionalPriceGroupListPageAsync{dimensionalPriceGroupsService=$dimensionalPriceGroupsService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -71,22 +56,80 @@ private constructor(
         )
     }
 
-    fun getNextPage(): CompletableFuture<Optional<DimensionalPriceGroupListPageAsync>> {
-        return getNextPageParams()
-            .map { dimensionalPriceGroupsService.list(it).thenApply { Optional.of(it) } }
+    fun getNextPage(): CompletableFuture<Optional<DimensionalPriceGroupListPageAsync>> =
+        getNextPageParams()
+            .map { service.list(it).thenApply { Optional.of(it) } }
             .orElseGet { CompletableFuture.completedFuture(Optional.empty()) }
-    }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): DimensionalPriceGroupListParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): DimensionalPriceGroups = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            dimensionalPriceGroupsService: DimensionalPriceGroupServiceAsync,
-            params: DimensionalPriceGroupListParams,
-            response: DimensionalPriceGroups,
-        ) = DimensionalPriceGroupListPageAsync(dimensionalPriceGroupsService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of
+         * [DimensionalPriceGroupListPageAsync].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [DimensionalPriceGroupListPageAsync]. */
+    class Builder internal constructor() {
+
+        private var service: DimensionalPriceGroupServiceAsync? = null
+        private var params: DimensionalPriceGroupListParams? = null
+        private var response: DimensionalPriceGroups? = null
+
+        @JvmSynthetic
+        internal fun from(dimensionalPriceGroupListPageAsync: DimensionalPriceGroupListPageAsync) =
+            apply {
+                service = dimensionalPriceGroupListPageAsync.service
+                params = dimensionalPriceGroupListPageAsync.params
+                response = dimensionalPriceGroupListPageAsync.response
+            }
+
+        fun service(service: DimensionalPriceGroupServiceAsync) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: DimensionalPriceGroupListParams) = apply { this.params = params }
+
+        /** The response that this page was parsed from. */
+        fun response(response: DimensionalPriceGroups) = apply { this.response = response }
+
+        /**
+         * Returns an immutable instance of [DimensionalPriceGroupListPageAsync].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): DimensionalPriceGroupListPageAsync =
+            DimensionalPriceGroupListPageAsync(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: DimensionalPriceGroupListPageAsync) {
@@ -117,4 +160,17 @@ private constructor(
             return forEach(values::add, executor).thenApply { values }
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is DimensionalPriceGroupListPageAsync && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() =
+        "DimensionalPriceGroupListPageAsync{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/EventBackfillListPage.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/EventBackfillListPage.kt
index 296e9dc08..bfcc86365 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/EventBackfillListPage.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/EventBackfillListPage.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.blocking.events.BackfillService
 import java.util.Objects
 import java.util.Optional
@@ -9,24 +10,14 @@ import java.util.stream.Stream
 import java.util.stream.StreamSupport
 import kotlin.jvm.optionals.getOrNull
 
-/**
- * This endpoint returns a list of all backfills in a list format.
- *
- * The list of backfills is ordered starting from the most recently created backfill. The response
- * also includes [`pagination_metadata`](/api-reference/pagination), which lets the caller retrieve
- * the next page of results if they exist. More information about pagination can be found in the
- * [Pagination-metadata schema](pagination).
- */
+/** @see [BackfillService.list] */
 class EventBackfillListPage
 private constructor(
-    private val backfillsService: BackfillService,
+    private val service: BackfillService,
     private val params: EventBackfillListParams,
     private val response: EventBackfillListPageResponse,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): EventBackfillListPageResponse = response
-
     /**
      * Delegates to [EventBackfillListPageResponse], but gracefully handles missing data.
      *
@@ -43,19 +34,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is EventBackfillListPage && backfillsService == other.backfillsService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(backfillsService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "EventBackfillListPage{backfillsService=$backfillsService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -77,20 +55,76 @@ private constructor(
         )
     }
 
-    fun getNextPage(): Optional<EventBackfillListPage> {
-        return getNextPageParams().map { backfillsService.list(it) }
-    }
+    fun getNextPage(): Optional<EventBackfillListPage> =
+        getNextPageParams().map { service.list(it) }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): EventBackfillListParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): EventBackfillListPageResponse = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            backfillsService: BackfillService,
-            params: EventBackfillListParams,
-            response: EventBackfillListPageResponse,
-        ) = EventBackfillListPage(backfillsService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of [EventBackfillListPage].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [EventBackfillListPage]. */
+    class Builder internal constructor() {
+
+        private var service: BackfillService? = null
+        private var params: EventBackfillListParams? = null
+        private var response: EventBackfillListPageResponse? = null
+
+        @JvmSynthetic
+        internal fun from(eventBackfillListPage: EventBackfillListPage) = apply {
+            service = eventBackfillListPage.service
+            params = eventBackfillListPage.params
+            response = eventBackfillListPage.response
+        }
+
+        fun service(service: BackfillService) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: EventBackfillListParams) = apply { this.params = params }
+
+        /** The response that this page was parsed from. */
+        fun response(response: EventBackfillListPageResponse) = apply { this.response = response }
+
+        /**
+         * Returns an immutable instance of [EventBackfillListPage].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): EventBackfillListPage =
+            EventBackfillListPage(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: EventBackfillListPage) :
@@ -112,4 +146,17 @@ private constructor(
             return StreamSupport.stream(spliterator(), false)
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is EventBackfillListPage && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() =
+        "EventBackfillListPage{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/EventBackfillListPageAsync.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/EventBackfillListPageAsync.kt
index 623ca86e9..21a3d2533 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/EventBackfillListPageAsync.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/EventBackfillListPageAsync.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.async.events.BackfillServiceAsync
 import java.util.Objects
 import java.util.Optional
@@ -10,24 +11,14 @@ import java.util.concurrent.Executor
 import java.util.function.Predicate
 import kotlin.jvm.optionals.getOrNull
 
-/**
- * This endpoint returns a list of all backfills in a list format.
- *
- * The list of backfills is ordered starting from the most recently created backfill. The response
- * also includes [`pagination_metadata`](/api-reference/pagination), which lets the caller retrieve
- * the next page of results if they exist. More information about pagination can be found in the
- * [Pagination-metadata schema](pagination).
- */
+/** @see [BackfillServiceAsync.list] */
 class EventBackfillListPageAsync
 private constructor(
-    private val backfillsService: BackfillServiceAsync,
+    private val service: BackfillServiceAsync,
     private val params: EventBackfillListParams,
     private val response: EventBackfillListPageResponse,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): EventBackfillListPageResponse = response
-
     /**
      * Delegates to [EventBackfillListPageResponse], but gracefully handles missing data.
      *
@@ -44,19 +35,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is EventBackfillListPageAsync && backfillsService == other.backfillsService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(backfillsService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "EventBackfillListPageAsync{backfillsService=$backfillsService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -78,22 +56,78 @@ private constructor(
         )
     }
 
-    fun getNextPage(): CompletableFuture<Optional<EventBackfillListPageAsync>> {
-        return getNextPageParams()
-            .map { backfillsService.list(it).thenApply { Optional.of(it) } }
+    fun getNextPage(): CompletableFuture<Optional<EventBackfillListPageAsync>> =
+        getNextPageParams()
+            .map { service.list(it).thenApply { Optional.of(it) } }
             .orElseGet { CompletableFuture.completedFuture(Optional.empty()) }
-    }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): EventBackfillListParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): EventBackfillListPageResponse = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            backfillsService: BackfillServiceAsync,
-            params: EventBackfillListParams,
-            response: EventBackfillListPageResponse,
-        ) = EventBackfillListPageAsync(backfillsService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of [EventBackfillListPageAsync].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [EventBackfillListPageAsync]. */
+    class Builder internal constructor() {
+
+        private var service: BackfillServiceAsync? = null
+        private var params: EventBackfillListParams? = null
+        private var response: EventBackfillListPageResponse? = null
+
+        @JvmSynthetic
+        internal fun from(eventBackfillListPageAsync: EventBackfillListPageAsync) = apply {
+            service = eventBackfillListPageAsync.service
+            params = eventBackfillListPageAsync.params
+            response = eventBackfillListPageAsync.response
+        }
+
+        fun service(service: BackfillServiceAsync) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: EventBackfillListParams) = apply { this.params = params }
+
+        /** The response that this page was parsed from. */
+        fun response(response: EventBackfillListPageResponse) = apply { this.response = response }
+
+        /**
+         * Returns an immutable instance of [EventBackfillListPageAsync].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): EventBackfillListPageAsync =
+            EventBackfillListPageAsync(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: EventBackfillListPageAsync) {
@@ -124,4 +158,17 @@ private constructor(
             return forEach(values::add, executor).thenApply { values }
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is EventBackfillListPageAsync && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() =
+        "EventBackfillListPageAsync{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/InvoiceListPage.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/InvoiceListPage.kt
index d125013b2..6584cb93d 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/InvoiceListPage.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/InvoiceListPage.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.blocking.InvoiceService
 import java.util.Objects
 import java.util.Optional
@@ -9,30 +10,14 @@ import java.util.stream.Stream
 import java.util.stream.StreamSupport
 import kotlin.jvm.optionals.getOrNull
 
-/**
- * This endpoint returns a list of all [`Invoice`](/core-concepts#invoice)s for an account in a list
- * format.
- *
- * The list of invoices is ordered starting from the most recently issued invoice date. The response
- * also includes [`pagination_metadata`](/api-reference/pagination), which lets the caller retrieve
- * the next page of results if they exist.
- *
- * By default, this only returns invoices that are `issued`, `paid`, or `synced`.
- *
- * When fetching any `draft` invoices, this returns the last-computed invoice values for each draft
- * invoice, which may not always be up-to-date since Orb regularly refreshes invoices
- * asynchronously.
- */
+/** @see [InvoiceService.list] */
 class InvoiceListPage
 private constructor(
-    private val invoicesService: InvoiceService,
+    private val service: InvoiceService,
     private val params: InvoiceListParams,
     private val response: InvoiceListPageResponse,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): InvoiceListPageResponse = response
-
     /**
      * Delegates to [InvoiceListPageResponse], but gracefully handles missing data.
      *
@@ -48,19 +33,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is InvoiceListPage && invoicesService == other.invoicesService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(invoicesService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "InvoiceListPage{invoicesService=$invoicesService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -82,20 +54,75 @@ private constructor(
         )
     }
 
-    fun getNextPage(): Optional<InvoiceListPage> {
-        return getNextPageParams().map { invoicesService.list(it) }
-    }
+    fun getNextPage(): Optional<InvoiceListPage> = getNextPageParams().map { service.list(it) }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): InvoiceListParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): InvoiceListPageResponse = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            invoicesService: InvoiceService,
-            params: InvoiceListParams,
-            response: InvoiceListPageResponse,
-        ) = InvoiceListPage(invoicesService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of [InvoiceListPage].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [InvoiceListPage]. */
+    class Builder internal constructor() {
+
+        private var service: InvoiceService? = null
+        private var params: InvoiceListParams? = null
+        private var response: InvoiceListPageResponse? = null
+
+        @JvmSynthetic
+        internal fun from(invoiceListPage: InvoiceListPage) = apply {
+            service = invoiceListPage.service
+            params = invoiceListPage.params
+            response = invoiceListPage.response
+        }
+
+        fun service(service: InvoiceService) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: InvoiceListParams) = apply { this.params = params }
+
+        /** The response that this page was parsed from. */
+        fun response(response: InvoiceListPageResponse) = apply { this.response = response }
+
+        /**
+         * Returns an immutable instance of [InvoiceListPage].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): InvoiceListPage =
+            InvoiceListPage(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: InvoiceListPage) : Iterable<Invoice> {
@@ -116,4 +143,17 @@ private constructor(
             return StreamSupport.stream(spliterator(), false)
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is InvoiceListPage && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() =
+        "InvoiceListPage{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/InvoiceListPageAsync.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/InvoiceListPageAsync.kt
index 2796213d7..4ae13b3a0 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/InvoiceListPageAsync.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/InvoiceListPageAsync.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.async.InvoiceServiceAsync
 import java.util.Objects
 import java.util.Optional
@@ -10,30 +11,14 @@ import java.util.concurrent.Executor
 import java.util.function.Predicate
 import kotlin.jvm.optionals.getOrNull
 
-/**
- * This endpoint returns a list of all [`Invoice`](/core-concepts#invoice)s for an account in a list
- * format.
- *
- * The list of invoices is ordered starting from the most recently issued invoice date. The response
- * also includes [`pagination_metadata`](/api-reference/pagination), which lets the caller retrieve
- * the next page of results if they exist.
- *
- * By default, this only returns invoices that are `issued`, `paid`, or `synced`.
- *
- * When fetching any `draft` invoices, this returns the last-computed invoice values for each draft
- * invoice, which may not always be up-to-date since Orb regularly refreshes invoices
- * asynchronously.
- */
+/** @see [InvoiceServiceAsync.list] */
 class InvoiceListPageAsync
 private constructor(
-    private val invoicesService: InvoiceServiceAsync,
+    private val service: InvoiceServiceAsync,
     private val params: InvoiceListParams,
     private val response: InvoiceListPageResponse,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): InvoiceListPageResponse = response
-
     /**
      * Delegates to [InvoiceListPageResponse], but gracefully handles missing data.
      *
@@ -49,19 +34,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is InvoiceListPageAsync && invoicesService == other.invoicesService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(invoicesService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "InvoiceListPageAsync{invoicesService=$invoicesService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -83,22 +55,78 @@ private constructor(
         )
     }
 
-    fun getNextPage(): CompletableFuture<Optional<InvoiceListPageAsync>> {
-        return getNextPageParams()
-            .map { invoicesService.list(it).thenApply { Optional.of(it) } }
+    fun getNextPage(): CompletableFuture<Optional<InvoiceListPageAsync>> =
+        getNextPageParams()
+            .map { service.list(it).thenApply { Optional.of(it) } }
             .orElseGet { CompletableFuture.completedFuture(Optional.empty()) }
-    }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): InvoiceListParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): InvoiceListPageResponse = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            invoicesService: InvoiceServiceAsync,
-            params: InvoiceListParams,
-            response: InvoiceListPageResponse,
-        ) = InvoiceListPageAsync(invoicesService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of [InvoiceListPageAsync].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [InvoiceListPageAsync]. */
+    class Builder internal constructor() {
+
+        private var service: InvoiceServiceAsync? = null
+        private var params: InvoiceListParams? = null
+        private var response: InvoiceListPageResponse? = null
+
+        @JvmSynthetic
+        internal fun from(invoiceListPageAsync: InvoiceListPageAsync) = apply {
+            service = invoiceListPageAsync.service
+            params = invoiceListPageAsync.params
+            response = invoiceListPageAsync.response
+        }
+
+        fun service(service: InvoiceServiceAsync) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: InvoiceListParams) = apply { this.params = params }
+
+        /** The response that this page was parsed from. */
+        fun response(response: InvoiceListPageResponse) = apply { this.response = response }
+
+        /**
+         * Returns an immutable instance of [InvoiceListPageAsync].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): InvoiceListPageAsync =
+            InvoiceListPageAsync(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: InvoiceListPageAsync) {
@@ -126,4 +154,17 @@ private constructor(
             return forEach(values::add, executor).thenApply { values }
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is InvoiceListPageAsync && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() =
+        "InvoiceListPageAsync{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/ItemListPage.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/ItemListPage.kt
index 86b88d770..49f8acf10 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/ItemListPage.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/ItemListPage.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.blocking.ItemService
 import java.util.Objects
 import java.util.Optional
@@ -9,17 +10,14 @@ import java.util.stream.Stream
 import java.util.stream.StreamSupport
 import kotlin.jvm.optionals.getOrNull
 
-/** This endpoint returns a list of all Items, ordered in descending order by creation time. */
+/** @see [ItemService.list] */
 class ItemListPage
 private constructor(
-    private val itemsService: ItemService,
+    private val service: ItemService,
     private val params: ItemListParams,
     private val response: ItemListPageResponse,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): ItemListPageResponse = response
-
     /**
      * Delegates to [ItemListPageResponse], but gracefully handles missing data.
      *
@@ -35,19 +33,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is ItemListPage && itemsService == other.itemsService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(itemsService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "ItemListPage{itemsService=$itemsService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -69,17 +54,75 @@ private constructor(
         )
     }
 
-    fun getNextPage(): Optional<ItemListPage> {
-        return getNextPageParams().map { itemsService.list(it) }
-    }
+    fun getNextPage(): Optional<ItemListPage> = getNextPageParams().map { service.list(it) }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): ItemListParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): ItemListPageResponse = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(itemsService: ItemService, params: ItemListParams, response: ItemListPageResponse) =
-            ItemListPage(itemsService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of [ItemListPage].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [ItemListPage]. */
+    class Builder internal constructor() {
+
+        private var service: ItemService? = null
+        private var params: ItemListParams? = null
+        private var response: ItemListPageResponse? = null
+
+        @JvmSynthetic
+        internal fun from(itemListPage: ItemListPage) = apply {
+            service = itemListPage.service
+            params = itemListPage.params
+            response = itemListPage.response
+        }
+
+        fun service(service: ItemService) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: ItemListParams) = apply { this.params = params }
+
+        /** The response that this page was parsed from. */
+        fun response(response: ItemListPageResponse) = apply { this.response = response }
+
+        /**
+         * Returns an immutable instance of [ItemListPage].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): ItemListPage =
+            ItemListPage(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: ItemListPage) : Iterable<Item> {
@@ -100,4 +143,16 @@ private constructor(
             return StreamSupport.stream(spliterator(), false)
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is ItemListPage && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() = "ItemListPage{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/ItemListPageAsync.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/ItemListPageAsync.kt
index d0178cd69..fb75f340f 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/ItemListPageAsync.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/ItemListPageAsync.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.async.ItemServiceAsync
 import java.util.Objects
 import java.util.Optional
@@ -10,17 +11,14 @@ import java.util.concurrent.Executor
 import java.util.function.Predicate
 import kotlin.jvm.optionals.getOrNull
 
-/** This endpoint returns a list of all Items, ordered in descending order by creation time. */
+/** @see [ItemServiceAsync.list] */
 class ItemListPageAsync
 private constructor(
-    private val itemsService: ItemServiceAsync,
+    private val service: ItemServiceAsync,
     private val params: ItemListParams,
     private val response: ItemListPageResponse,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): ItemListPageResponse = response
-
     /**
      * Delegates to [ItemListPageResponse], but gracefully handles missing data.
      *
@@ -36,19 +34,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is ItemListPageAsync && itemsService == other.itemsService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(itemsService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "ItemListPageAsync{itemsService=$itemsService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -70,22 +55,78 @@ private constructor(
         )
     }
 
-    fun getNextPage(): CompletableFuture<Optional<ItemListPageAsync>> {
-        return getNextPageParams()
-            .map { itemsService.list(it).thenApply { Optional.of(it) } }
+    fun getNextPage(): CompletableFuture<Optional<ItemListPageAsync>> =
+        getNextPageParams()
+            .map { service.list(it).thenApply { Optional.of(it) } }
             .orElseGet { CompletableFuture.completedFuture(Optional.empty()) }
-    }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): ItemListParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): ItemListPageResponse = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            itemsService: ItemServiceAsync,
-            params: ItemListParams,
-            response: ItemListPageResponse,
-        ) = ItemListPageAsync(itemsService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of [ItemListPageAsync].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [ItemListPageAsync]. */
+    class Builder internal constructor() {
+
+        private var service: ItemServiceAsync? = null
+        private var params: ItemListParams? = null
+        private var response: ItemListPageResponse? = null
+
+        @JvmSynthetic
+        internal fun from(itemListPageAsync: ItemListPageAsync) = apply {
+            service = itemListPageAsync.service
+            params = itemListPageAsync.params
+            response = itemListPageAsync.response
+        }
+
+        fun service(service: ItemServiceAsync) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: ItemListParams) = apply { this.params = params }
+
+        /** The response that this page was parsed from. */
+        fun response(response: ItemListPageResponse) = apply { this.response = response }
+
+        /**
+         * Returns an immutable instance of [ItemListPageAsync].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): ItemListPageAsync =
+            ItemListPageAsync(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: ItemListPageAsync) {
@@ -113,4 +154,17 @@ private constructor(
             return forEach(values::add, executor).thenApply { values }
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is ItemListPageAsync && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() =
+        "ItemListPageAsync{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/MetricListPage.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/MetricListPage.kt
index a2154ad21..bd8cb5043 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/MetricListPage.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/MetricListPage.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.blocking.MetricService
 import java.util.Objects
 import java.util.Optional
@@ -9,20 +10,14 @@ import java.util.stream.Stream
 import java.util.stream.StreamSupport
 import kotlin.jvm.optionals.getOrNull
 
-/**
- * This endpoint is used to fetch [metric](/core-concepts##metric) details given a metric
- * identifier. It returns information about the metrics including its name, description, and item.
- */
+/** @see [MetricService.list] */
 class MetricListPage
 private constructor(
-    private val metricsService: MetricService,
+    private val service: MetricService,
     private val params: MetricListParams,
     private val response: MetricListPageResponse,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): MetricListPageResponse = response
-
     /**
      * Delegates to [MetricListPageResponse], but gracefully handles missing data.
      *
@@ -39,19 +34,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is MetricListPage && metricsService == other.metricsService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(metricsService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "MetricListPage{metricsService=$metricsService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -73,20 +55,75 @@ private constructor(
         )
     }
 
-    fun getNextPage(): Optional<MetricListPage> {
-        return getNextPageParams().map { metricsService.list(it) }
-    }
+    fun getNextPage(): Optional<MetricListPage> = getNextPageParams().map { service.list(it) }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): MetricListParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): MetricListPageResponse = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            metricsService: MetricService,
-            params: MetricListParams,
-            response: MetricListPageResponse,
-        ) = MetricListPage(metricsService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of [MetricListPage].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [MetricListPage]. */
+    class Builder internal constructor() {
+
+        private var service: MetricService? = null
+        private var params: MetricListParams? = null
+        private var response: MetricListPageResponse? = null
+
+        @JvmSynthetic
+        internal fun from(metricListPage: MetricListPage) = apply {
+            service = metricListPage.service
+            params = metricListPage.params
+            response = metricListPage.response
+        }
+
+        fun service(service: MetricService) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: MetricListParams) = apply { this.params = params }
+
+        /** The response that this page was parsed from. */
+        fun response(response: MetricListPageResponse) = apply { this.response = response }
+
+        /**
+         * Returns an immutable instance of [MetricListPage].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): MetricListPage =
+            MetricListPage(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: MetricListPage) : Iterable<BillableMetric> {
@@ -107,4 +144,16 @@ private constructor(
             return StreamSupport.stream(spliterator(), false)
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is MetricListPage && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() = "MetricListPage{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/MetricListPageAsync.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/MetricListPageAsync.kt
index 9f1c9d41f..9f509035a 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/MetricListPageAsync.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/MetricListPageAsync.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.async.MetricServiceAsync
 import java.util.Objects
 import java.util.Optional
@@ -10,20 +11,14 @@ import java.util.concurrent.Executor
 import java.util.function.Predicate
 import kotlin.jvm.optionals.getOrNull
 
-/**
- * This endpoint is used to fetch [metric](/core-concepts##metric) details given a metric
- * identifier. It returns information about the metrics including its name, description, and item.
- */
+/** @see [MetricServiceAsync.list] */
 class MetricListPageAsync
 private constructor(
-    private val metricsService: MetricServiceAsync,
+    private val service: MetricServiceAsync,
     private val params: MetricListParams,
     private val response: MetricListPageResponse,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): MetricListPageResponse = response
-
     /**
      * Delegates to [MetricListPageResponse], but gracefully handles missing data.
      *
@@ -40,19 +35,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is MetricListPageAsync && metricsService == other.metricsService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(metricsService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "MetricListPageAsync{metricsService=$metricsService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -74,22 +56,78 @@ private constructor(
         )
     }
 
-    fun getNextPage(): CompletableFuture<Optional<MetricListPageAsync>> {
-        return getNextPageParams()
-            .map { metricsService.list(it).thenApply { Optional.of(it) } }
+    fun getNextPage(): CompletableFuture<Optional<MetricListPageAsync>> =
+        getNextPageParams()
+            .map { service.list(it).thenApply { Optional.of(it) } }
             .orElseGet { CompletableFuture.completedFuture(Optional.empty()) }
-    }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): MetricListParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): MetricListPageResponse = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            metricsService: MetricServiceAsync,
-            params: MetricListParams,
-            response: MetricListPageResponse,
-        ) = MetricListPageAsync(metricsService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of [MetricListPageAsync].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [MetricListPageAsync]. */
+    class Builder internal constructor() {
+
+        private var service: MetricServiceAsync? = null
+        private var params: MetricListParams? = null
+        private var response: MetricListPageResponse? = null
+
+        @JvmSynthetic
+        internal fun from(metricListPageAsync: MetricListPageAsync) = apply {
+            service = metricListPageAsync.service
+            params = metricListPageAsync.params
+            response = metricListPageAsync.response
+        }
+
+        fun service(service: MetricServiceAsync) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: MetricListParams) = apply { this.params = params }
+
+        /** The response that this page was parsed from. */
+        fun response(response: MetricListPageResponse) = apply { this.response = response }
+
+        /**
+         * Returns an immutable instance of [MetricListPageAsync].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): MetricListPageAsync =
+            MetricListPageAsync(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: MetricListPageAsync) {
@@ -120,4 +158,17 @@ private constructor(
             return forEach(values::add, executor).thenApply { values }
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is MetricListPageAsync && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() =
+        "MetricListPageAsync{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/PlanListPage.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/PlanListPage.kt
index 9df790806..3442a4638 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/PlanListPage.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/PlanListPage.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.blocking.PlanService
 import java.util.Objects
 import java.util.Optional
@@ -9,22 +10,14 @@ import java.util.stream.Stream
 import java.util.stream.StreamSupport
 import kotlin.jvm.optionals.getOrNull
 
-/**
- * This endpoint returns a list of all [plans](/core-concepts#plan-and-price) for an account in a
- * list format. The list of plans is ordered starting from the most recently created plan. The
- * response also includes [`pagination_metadata`](/api-reference/pagination), which lets the caller
- * retrieve the next page of results if they exist.
- */
+/** @see [PlanService.list] */
 class PlanListPage
 private constructor(
-    private val plansService: PlanService,
+    private val service: PlanService,
     private val params: PlanListParams,
     private val response: PlanListPageResponse,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): PlanListPageResponse = response
-
     /**
      * Delegates to [PlanListPageResponse], but gracefully handles missing data.
      *
@@ -40,19 +33,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is PlanListPage && plansService == other.plansService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(plansService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "PlanListPage{plansService=$plansService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -74,17 +54,75 @@ private constructor(
         )
     }
 
-    fun getNextPage(): Optional<PlanListPage> {
-        return getNextPageParams().map { plansService.list(it) }
-    }
+    fun getNextPage(): Optional<PlanListPage> = getNextPageParams().map { service.list(it) }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): PlanListParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): PlanListPageResponse = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(plansService: PlanService, params: PlanListParams, response: PlanListPageResponse) =
-            PlanListPage(plansService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of [PlanListPage].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [PlanListPage]. */
+    class Builder internal constructor() {
+
+        private var service: PlanService? = null
+        private var params: PlanListParams? = null
+        private var response: PlanListPageResponse? = null
+
+        @JvmSynthetic
+        internal fun from(planListPage: PlanListPage) = apply {
+            service = planListPage.service
+            params = planListPage.params
+            response = planListPage.response
+        }
+
+        fun service(service: PlanService) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: PlanListParams) = apply { this.params = params }
+
+        /** The response that this page was parsed from. */
+        fun response(response: PlanListPageResponse) = apply { this.response = response }
+
+        /**
+         * Returns an immutable instance of [PlanListPage].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): PlanListPage =
+            PlanListPage(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: PlanListPage) : Iterable<Plan> {
@@ -105,4 +143,16 @@ private constructor(
             return StreamSupport.stream(spliterator(), false)
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is PlanListPage && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() = "PlanListPage{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/PlanListPageAsync.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/PlanListPageAsync.kt
index f8154d594..f12c610fe 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/PlanListPageAsync.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/PlanListPageAsync.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.async.PlanServiceAsync
 import java.util.Objects
 import java.util.Optional
@@ -10,22 +11,14 @@ import java.util.concurrent.Executor
 import java.util.function.Predicate
 import kotlin.jvm.optionals.getOrNull
 
-/**
- * This endpoint returns a list of all [plans](/core-concepts#plan-and-price) for an account in a
- * list format. The list of plans is ordered starting from the most recently created plan. The
- * response also includes [`pagination_metadata`](/api-reference/pagination), which lets the caller
- * retrieve the next page of results if they exist.
- */
+/** @see [PlanServiceAsync.list] */
 class PlanListPageAsync
 private constructor(
-    private val plansService: PlanServiceAsync,
+    private val service: PlanServiceAsync,
     private val params: PlanListParams,
     private val response: PlanListPageResponse,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): PlanListPageResponse = response
-
     /**
      * Delegates to [PlanListPageResponse], but gracefully handles missing data.
      *
@@ -41,19 +34,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is PlanListPageAsync && plansService == other.plansService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(plansService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "PlanListPageAsync{plansService=$plansService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -75,22 +55,78 @@ private constructor(
         )
     }
 
-    fun getNextPage(): CompletableFuture<Optional<PlanListPageAsync>> {
-        return getNextPageParams()
-            .map { plansService.list(it).thenApply { Optional.of(it) } }
+    fun getNextPage(): CompletableFuture<Optional<PlanListPageAsync>> =
+        getNextPageParams()
+            .map { service.list(it).thenApply { Optional.of(it) } }
             .orElseGet { CompletableFuture.completedFuture(Optional.empty()) }
-    }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): PlanListParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): PlanListPageResponse = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            plansService: PlanServiceAsync,
-            params: PlanListParams,
-            response: PlanListPageResponse,
-        ) = PlanListPageAsync(plansService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of [PlanListPageAsync].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [PlanListPageAsync]. */
+    class Builder internal constructor() {
+
+        private var service: PlanServiceAsync? = null
+        private var params: PlanListParams? = null
+        private var response: PlanListPageResponse? = null
+
+        @JvmSynthetic
+        internal fun from(planListPageAsync: PlanListPageAsync) = apply {
+            service = planListPageAsync.service
+            params = planListPageAsync.params
+            response = planListPageAsync.response
+        }
+
+        fun service(service: PlanServiceAsync) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: PlanListParams) = apply { this.params = params }
+
+        /** The response that this page was parsed from. */
+        fun response(response: PlanListPageResponse) = apply { this.response = response }
+
+        /**
+         * Returns an immutable instance of [PlanListPageAsync].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): PlanListPageAsync =
+            PlanListPageAsync(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: PlanListPageAsync) {
@@ -118,4 +154,17 @@ private constructor(
             return forEach(values::add, executor).thenApply { values }
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is PlanListPageAsync && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() =
+        "PlanListPageAsync{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/PriceListPage.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/PriceListPage.kt
index a465d17a7..90ac2e313 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/PriceListPage.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/PriceListPage.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.blocking.PriceService
 import java.util.Objects
 import java.util.Optional
@@ -9,20 +10,14 @@ import java.util.stream.Stream
 import java.util.stream.StreamSupport
 import kotlin.jvm.optionals.getOrNull
 
-/**
- * This endpoint is used to list all add-on prices created using the
- * [price creation endpoint](/api-reference/price/create-price).
- */
+/** @see [PriceService.list] */
 class PriceListPage
 private constructor(
-    private val pricesService: PriceService,
+    private val service: PriceService,
     private val params: PriceListParams,
     private val response: PriceListPageResponse,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): PriceListPageResponse = response
-
     /**
      * Delegates to [PriceListPageResponse], but gracefully handles missing data.
      *
@@ -38,19 +33,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is PriceListPage && pricesService == other.pricesService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(pricesService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "PriceListPage{pricesService=$pricesService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -72,20 +54,75 @@ private constructor(
         )
     }
 
-    fun getNextPage(): Optional<PriceListPage> {
-        return getNextPageParams().map { pricesService.list(it) }
-    }
+    fun getNextPage(): Optional<PriceListPage> = getNextPageParams().map { service.list(it) }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): PriceListParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): PriceListPageResponse = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            pricesService: PriceService,
-            params: PriceListParams,
-            response: PriceListPageResponse,
-        ) = PriceListPage(pricesService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of [PriceListPage].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [PriceListPage]. */
+    class Builder internal constructor() {
+
+        private var service: PriceService? = null
+        private var params: PriceListParams? = null
+        private var response: PriceListPageResponse? = null
+
+        @JvmSynthetic
+        internal fun from(priceListPage: PriceListPage) = apply {
+            service = priceListPage.service
+            params = priceListPage.params
+            response = priceListPage.response
+        }
+
+        fun service(service: PriceService) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: PriceListParams) = apply { this.params = params }
+
+        /** The response that this page was parsed from. */
+        fun response(response: PriceListPageResponse) = apply { this.response = response }
+
+        /**
+         * Returns an immutable instance of [PriceListPage].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): PriceListPage =
+            PriceListPage(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: PriceListPage) : Iterable<Price> {
@@ -106,4 +143,16 @@ private constructor(
             return StreamSupport.stream(spliterator(), false)
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is PriceListPage && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() = "PriceListPage{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/PriceListPageAsync.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/PriceListPageAsync.kt
index d149b008f..e38c33a45 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/PriceListPageAsync.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/PriceListPageAsync.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.async.PriceServiceAsync
 import java.util.Objects
 import java.util.Optional
@@ -10,20 +11,14 @@ import java.util.concurrent.Executor
 import java.util.function.Predicate
 import kotlin.jvm.optionals.getOrNull
 
-/**
- * This endpoint is used to list all add-on prices created using the
- * [price creation endpoint](/api-reference/price/create-price).
- */
+/** @see [PriceServiceAsync.list] */
 class PriceListPageAsync
 private constructor(
-    private val pricesService: PriceServiceAsync,
+    private val service: PriceServiceAsync,
     private val params: PriceListParams,
     private val response: PriceListPageResponse,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): PriceListPageResponse = response
-
     /**
      * Delegates to [PriceListPageResponse], but gracefully handles missing data.
      *
@@ -39,19 +34,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is PriceListPageAsync && pricesService == other.pricesService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(pricesService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "PriceListPageAsync{pricesService=$pricesService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -73,22 +55,78 @@ private constructor(
         )
     }
 
-    fun getNextPage(): CompletableFuture<Optional<PriceListPageAsync>> {
-        return getNextPageParams()
-            .map { pricesService.list(it).thenApply { Optional.of(it) } }
+    fun getNextPage(): CompletableFuture<Optional<PriceListPageAsync>> =
+        getNextPageParams()
+            .map { service.list(it).thenApply { Optional.of(it) } }
             .orElseGet { CompletableFuture.completedFuture(Optional.empty()) }
-    }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): PriceListParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): PriceListPageResponse = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            pricesService: PriceServiceAsync,
-            params: PriceListParams,
-            response: PriceListPageResponse,
-        ) = PriceListPageAsync(pricesService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of [PriceListPageAsync].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [PriceListPageAsync]. */
+    class Builder internal constructor() {
+
+        private var service: PriceServiceAsync? = null
+        private var params: PriceListParams? = null
+        private var response: PriceListPageResponse? = null
+
+        @JvmSynthetic
+        internal fun from(priceListPageAsync: PriceListPageAsync) = apply {
+            service = priceListPageAsync.service
+            params = priceListPageAsync.params
+            response = priceListPageAsync.response
+        }
+
+        fun service(service: PriceServiceAsync) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: PriceListParams) = apply { this.params = params }
+
+        /** The response that this page was parsed from. */
+        fun response(response: PriceListPageResponse) = apply { this.response = response }
+
+        /**
+         * Returns an immutable instance of [PriceListPageAsync].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): PriceListPageAsync =
+            PriceListPageAsync(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: PriceListPageAsync) {
@@ -116,4 +154,17 @@ private constructor(
             return forEach(values::add, executor).thenApply { values }
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is PriceListPageAsync && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() =
+        "PriceListPageAsync{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/SubscriptionFetchSchedulePage.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/SubscriptionFetchSchedulePage.kt
index d9442f317..2e815413a 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/SubscriptionFetchSchedulePage.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/SubscriptionFetchSchedulePage.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.blocking.SubscriptionService
 import java.util.Objects
 import java.util.Optional
@@ -9,21 +10,14 @@ import java.util.stream.Stream
 import java.util.stream.StreamSupport
 import kotlin.jvm.optionals.getOrNull
 
-/**
- * This endpoint returns a [paginated](/api-reference/pagination) list of all plans associated with
- * a subscription along with their start and end dates. This list contains the subscription's
- * initial plan along with past and future plan changes.
- */
+/** @see [SubscriptionService.fetchSchedule] */
 class SubscriptionFetchSchedulePage
 private constructor(
-    private val subscriptionsService: SubscriptionService,
+    private val service: SubscriptionService,
     private val params: SubscriptionFetchScheduleParams,
     private val response: SubscriptionFetchSchedulePageResponse,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): SubscriptionFetchSchedulePageResponse = response
-
     /**
      * Delegates to [SubscriptionFetchSchedulePageResponse], but gracefully handles missing data.
      *
@@ -40,19 +34,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is SubscriptionFetchSchedulePage && subscriptionsService == other.subscriptionsService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(subscriptionsService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "SubscriptionFetchSchedulePage{subscriptionsService=$subscriptionsService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -74,20 +55,79 @@ private constructor(
         )
     }
 
-    fun getNextPage(): Optional<SubscriptionFetchSchedulePage> {
-        return getNextPageParams().map { subscriptionsService.fetchSchedule(it) }
-    }
+    fun getNextPage(): Optional<SubscriptionFetchSchedulePage> =
+        getNextPageParams().map { service.fetchSchedule(it) }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): SubscriptionFetchScheduleParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): SubscriptionFetchSchedulePageResponse = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            subscriptionsService: SubscriptionService,
-            params: SubscriptionFetchScheduleParams,
-            response: SubscriptionFetchSchedulePageResponse,
-        ) = SubscriptionFetchSchedulePage(subscriptionsService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of
+         * [SubscriptionFetchSchedulePage].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [SubscriptionFetchSchedulePage]. */
+    class Builder internal constructor() {
+
+        private var service: SubscriptionService? = null
+        private var params: SubscriptionFetchScheduleParams? = null
+        private var response: SubscriptionFetchSchedulePageResponse? = null
+
+        @JvmSynthetic
+        internal fun from(subscriptionFetchSchedulePage: SubscriptionFetchSchedulePage) = apply {
+            service = subscriptionFetchSchedulePage.service
+            params = subscriptionFetchSchedulePage.params
+            response = subscriptionFetchSchedulePage.response
+        }
+
+        fun service(service: SubscriptionService) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: SubscriptionFetchScheduleParams) = apply { this.params = params }
+
+        /** The response that this page was parsed from. */
+        fun response(response: SubscriptionFetchSchedulePageResponse) = apply {
+            this.response = response
+        }
+
+        /**
+         * Returns an immutable instance of [SubscriptionFetchSchedulePage].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): SubscriptionFetchSchedulePage =
+            SubscriptionFetchSchedulePage(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: SubscriptionFetchSchedulePage) :
@@ -109,4 +149,17 @@ private constructor(
             return StreamSupport.stream(spliterator(), false)
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is SubscriptionFetchSchedulePage && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() =
+        "SubscriptionFetchSchedulePage{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/SubscriptionFetchSchedulePageAsync.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/SubscriptionFetchSchedulePageAsync.kt
index c8e1a1965..b98954526 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/SubscriptionFetchSchedulePageAsync.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/SubscriptionFetchSchedulePageAsync.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.async.SubscriptionServiceAsync
 import java.util.Objects
 import java.util.Optional
@@ -10,21 +11,14 @@ import java.util.concurrent.Executor
 import java.util.function.Predicate
 import kotlin.jvm.optionals.getOrNull
 
-/**
- * This endpoint returns a [paginated](/api-reference/pagination) list of all plans associated with
- * a subscription along with their start and end dates. This list contains the subscription's
- * initial plan along with past and future plan changes.
- */
+/** @see [SubscriptionServiceAsync.fetchSchedule] */
 class SubscriptionFetchSchedulePageAsync
 private constructor(
-    private val subscriptionsService: SubscriptionServiceAsync,
+    private val service: SubscriptionServiceAsync,
     private val params: SubscriptionFetchScheduleParams,
     private val response: SubscriptionFetchSchedulePageResponse,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): SubscriptionFetchSchedulePageResponse = response
-
     /**
      * Delegates to [SubscriptionFetchSchedulePageResponse], but gracefully handles missing data.
      *
@@ -41,19 +35,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is SubscriptionFetchSchedulePageAsync && subscriptionsService == other.subscriptionsService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(subscriptionsService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "SubscriptionFetchSchedulePageAsync{subscriptionsService=$subscriptionsService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -75,22 +56,82 @@ private constructor(
         )
     }
 
-    fun getNextPage(): CompletableFuture<Optional<SubscriptionFetchSchedulePageAsync>> {
-        return getNextPageParams()
-            .map { subscriptionsService.fetchSchedule(it).thenApply { Optional.of(it) } }
+    fun getNextPage(): CompletableFuture<Optional<SubscriptionFetchSchedulePageAsync>> =
+        getNextPageParams()
+            .map { service.fetchSchedule(it).thenApply { Optional.of(it) } }
             .orElseGet { CompletableFuture.completedFuture(Optional.empty()) }
-    }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): SubscriptionFetchScheduleParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): SubscriptionFetchSchedulePageResponse = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            subscriptionsService: SubscriptionServiceAsync,
-            params: SubscriptionFetchScheduleParams,
-            response: SubscriptionFetchSchedulePageResponse,
-        ) = SubscriptionFetchSchedulePageAsync(subscriptionsService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of
+         * [SubscriptionFetchSchedulePageAsync].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [SubscriptionFetchSchedulePageAsync]. */
+    class Builder internal constructor() {
+
+        private var service: SubscriptionServiceAsync? = null
+        private var params: SubscriptionFetchScheduleParams? = null
+        private var response: SubscriptionFetchSchedulePageResponse? = null
+
+        @JvmSynthetic
+        internal fun from(subscriptionFetchSchedulePageAsync: SubscriptionFetchSchedulePageAsync) =
+            apply {
+                service = subscriptionFetchSchedulePageAsync.service
+                params = subscriptionFetchSchedulePageAsync.params
+                response = subscriptionFetchSchedulePageAsync.response
+            }
+
+        fun service(service: SubscriptionServiceAsync) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: SubscriptionFetchScheduleParams) = apply { this.params = params }
+
+        /** The response that this page was parsed from. */
+        fun response(response: SubscriptionFetchSchedulePageResponse) = apply {
+            this.response = response
+        }
+
+        /**
+         * Returns an immutable instance of [SubscriptionFetchSchedulePageAsync].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): SubscriptionFetchSchedulePageAsync =
+            SubscriptionFetchSchedulePageAsync(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: SubscriptionFetchSchedulePageAsync) {
@@ -121,4 +162,17 @@ private constructor(
             return forEach(values::add, executor).thenApply { values }
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is SubscriptionFetchSchedulePageAsync && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() =
+        "SubscriptionFetchSchedulePageAsync{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/SubscriptionListPage.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/SubscriptionListPage.kt
index f052b9502..6dbe30e25 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/SubscriptionListPage.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/SubscriptionListPage.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.blocking.SubscriptionService
 import java.util.Objects
 import java.util.Optional
@@ -9,26 +10,14 @@ import java.util.stream.Stream
 import java.util.stream.StreamSupport
 import kotlin.jvm.optionals.getOrNull
 
-/**
- * This endpoint returns a list of all subscriptions for an account as a
- * [paginated](/api-reference/pagination) list, ordered starting from the most recently created
- * subscription. For a full discussion of the subscription resource, see
- * [Subscription](/core-concepts##subscription).
- *
- * Subscriptions can be filtered for a specific customer by using either the customer_id or
- * external_customer_id query parameters. To filter subscriptions for multiple customers, use the
- * customer_id[] or external_customer_id[] query parameters.
- */
+/** @see [SubscriptionService.list] */
 class SubscriptionListPage
 private constructor(
-    private val subscriptionsService: SubscriptionService,
+    private val service: SubscriptionService,
     private val params: SubscriptionListParams,
     private val response: Subscriptions,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): Subscriptions = response
-
     /**
      * Delegates to [Subscriptions], but gracefully handles missing data.
      *
@@ -44,19 +33,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is SubscriptionListPage && subscriptionsService == other.subscriptionsService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(subscriptionsService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "SubscriptionListPage{subscriptionsService=$subscriptionsService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -78,20 +54,75 @@ private constructor(
         )
     }
 
-    fun getNextPage(): Optional<SubscriptionListPage> {
-        return getNextPageParams().map { subscriptionsService.list(it) }
-    }
+    fun getNextPage(): Optional<SubscriptionListPage> = getNextPageParams().map { service.list(it) }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): SubscriptionListParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): Subscriptions = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            subscriptionsService: SubscriptionService,
-            params: SubscriptionListParams,
-            response: Subscriptions,
-        ) = SubscriptionListPage(subscriptionsService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of [SubscriptionListPage].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [SubscriptionListPage]. */
+    class Builder internal constructor() {
+
+        private var service: SubscriptionService? = null
+        private var params: SubscriptionListParams? = null
+        private var response: Subscriptions? = null
+
+        @JvmSynthetic
+        internal fun from(subscriptionListPage: SubscriptionListPage) = apply {
+            service = subscriptionListPage.service
+            params = subscriptionListPage.params
+            response = subscriptionListPage.response
+        }
+
+        fun service(service: SubscriptionService) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: SubscriptionListParams) = apply { this.params = params }
+
+        /** The response that this page was parsed from. */
+        fun response(response: Subscriptions) = apply { this.response = response }
+
+        /**
+         * Returns an immutable instance of [SubscriptionListPage].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): SubscriptionListPage =
+            SubscriptionListPage(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: SubscriptionListPage) : Iterable<Subscription> {
@@ -112,4 +143,17 @@ private constructor(
             return StreamSupport.stream(spliterator(), false)
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is SubscriptionListPage && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() =
+        "SubscriptionListPage{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/models/SubscriptionListPageAsync.kt b/orb-java-core/src/main/kotlin/com/withorb/api/models/SubscriptionListPageAsync.kt
index 16d9c4203..455951073 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/models/SubscriptionListPageAsync.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/models/SubscriptionListPageAsync.kt
@@ -2,6 +2,7 @@
 
 package com.withorb.api.models
 
+import com.withorb.api.core.checkRequired
 import com.withorb.api.services.async.SubscriptionServiceAsync
 import java.util.Objects
 import java.util.Optional
@@ -10,26 +11,14 @@ import java.util.concurrent.Executor
 import java.util.function.Predicate
 import kotlin.jvm.optionals.getOrNull
 
-/**
- * This endpoint returns a list of all subscriptions for an account as a
- * [paginated](/api-reference/pagination) list, ordered starting from the most recently created
- * subscription. For a full discussion of the subscription resource, see
- * [Subscription](/core-concepts##subscription).
- *
- * Subscriptions can be filtered for a specific customer by using either the customer_id or
- * external_customer_id query parameters. To filter subscriptions for multiple customers, use the
- * customer_id[] or external_customer_id[] query parameters.
- */
+/** @see [SubscriptionServiceAsync.list] */
 class SubscriptionListPageAsync
 private constructor(
-    private val subscriptionsService: SubscriptionServiceAsync,
+    private val service: SubscriptionServiceAsync,
     private val params: SubscriptionListParams,
     private val response: Subscriptions,
 ) {
 
-    /** Returns the response that this page was parsed from. */
-    fun response(): Subscriptions = response
-
     /**
      * Delegates to [Subscriptions], but gracefully handles missing data.
      *
@@ -45,19 +34,6 @@ private constructor(
     fun paginationMetadata(): Optional<PaginationMetadata> =
         response._paginationMetadata().getOptional("pagination_metadata")
 
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return /* spotless:off */ other is SubscriptionListPageAsync && subscriptionsService == other.subscriptionsService && params == other.params && response == other.response /* spotless:on */
-    }
-
-    override fun hashCode(): Int = /* spotless:off */ Objects.hash(subscriptionsService, params, response) /* spotless:on */
-
-    override fun toString() =
-        "SubscriptionListPageAsync{subscriptionsService=$subscriptionsService, params=$params, response=$response}"
-
     fun hasNextPage(): Boolean =
         data().isNotEmpty() &&
             paginationMetadata().flatMap { it._nextCursor().getOptional("next_cursor") }.isPresent
@@ -79,22 +55,78 @@ private constructor(
         )
     }
 
-    fun getNextPage(): CompletableFuture<Optional<SubscriptionListPageAsync>> {
-        return getNextPageParams()
-            .map { subscriptionsService.list(it).thenApply { Optional.of(it) } }
+    fun getNextPage(): CompletableFuture<Optional<SubscriptionListPageAsync>> =
+        getNextPageParams()
+            .map { service.list(it).thenApply { Optional.of(it) } }
             .orElseGet { CompletableFuture.completedFuture(Optional.empty()) }
-    }
 
     fun autoPager(): AutoPager = AutoPager(this)
 
+    /** The parameters that were used to request this page. */
+    fun params(): SubscriptionListParams = params
+
+    /** The response that this page was parsed from. */
+    fun response(): Subscriptions = response
+
+    fun toBuilder() = Builder().from(this)
+
     companion object {
 
-        @JvmStatic
-        fun of(
-            subscriptionsService: SubscriptionServiceAsync,
-            params: SubscriptionListParams,
-            response: Subscriptions,
-        ) = SubscriptionListPageAsync(subscriptionsService, params, response)
+        /**
+         * Returns a mutable builder for constructing an instance of [SubscriptionListPageAsync].
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         */
+        @JvmStatic fun builder() = Builder()
+    }
+
+    /** A builder for [SubscriptionListPageAsync]. */
+    class Builder internal constructor() {
+
+        private var service: SubscriptionServiceAsync? = null
+        private var params: SubscriptionListParams? = null
+        private var response: Subscriptions? = null
+
+        @JvmSynthetic
+        internal fun from(subscriptionListPageAsync: SubscriptionListPageAsync) = apply {
+            service = subscriptionListPageAsync.service
+            params = subscriptionListPageAsync.params
+            response = subscriptionListPageAsync.response
+        }
+
+        fun service(service: SubscriptionServiceAsync) = apply { this.service = service }
+
+        /** The parameters that were used to request this page. */
+        fun params(params: SubscriptionListParams) = apply { this.params = params }
+
+        /** The response that this page was parsed from. */
+        fun response(response: Subscriptions) = apply { this.response = response }
+
+        /**
+         * Returns an immutable instance of [SubscriptionListPageAsync].
+         *
+         * Further updates to this [Builder] will not mutate the returned instance.
+         *
+         * The following fields are required:
+         * ```java
+         * .service()
+         * .params()
+         * .response()
+         * ```
+         *
+         * @throws IllegalStateException if any required field is unset.
+         */
+        fun build(): SubscriptionListPageAsync =
+            SubscriptionListPageAsync(
+                checkRequired("service", service),
+                checkRequired("params", params),
+                checkRequired("response", response),
+            )
     }
 
     class AutoPager(private val firstPage: SubscriptionListPageAsync) {
@@ -122,4 +154,17 @@ private constructor(
             return forEach(values::add, executor).thenApply { values }
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) {
+            return true
+        }
+
+        return /* spotless:off */ other is SubscriptionListPageAsync && service == other.service && params == other.params && response == other.response /* spotless:on */
+    }
+
+    override fun hashCode(): Int = /* spotless:off */ Objects.hash(service, params, response) /* spotless:on */
+
+    override fun toString() =
+        "SubscriptionListPageAsync{service=$service, params=$params, response=$response}"
 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/services/async/AlertServiceAsyncImpl.kt b/orb-java-core/src/main/kotlin/com/withorb/api/services/async/AlertServiceAsyncImpl.kt
index eed3630c1..3a07f60d7 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/services/async/AlertServiceAsyncImpl.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/services/async/AlertServiceAsyncImpl.kt
@@ -184,11 +184,11 @@ class AlertServiceAsyncImpl internal constructor(private val clientOptions: Clie
                                 }
                             }
                             .let {
-                                AlertListPageAsync.of(
-                                    AlertServiceAsyncImpl(clientOptions),
-                                    params,
-                                    it,
-                                )
+                                AlertListPageAsync.builder()
+                                    .service(AlertServiceAsyncImpl(clientOptions))
+                                    .params(params)
+                                    .response(it)
+                                    .build()
                             }
                     }
                 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/services/async/CouponServiceAsyncImpl.kt b/orb-java-core/src/main/kotlin/com/withorb/api/services/async/CouponServiceAsyncImpl.kt
index d4991cdc1..38a83bca3 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/services/async/CouponServiceAsyncImpl.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/services/async/CouponServiceAsyncImpl.kt
@@ -137,11 +137,11 @@ class CouponServiceAsyncImpl internal constructor(private val clientOptions: Cli
                                 }
                             }
                             .let {
-                                CouponListPageAsync.of(
-                                    CouponServiceAsyncImpl(clientOptions),
-                                    params,
-                                    it,
-                                )
+                                CouponListPageAsync.builder()
+                                    .service(CouponServiceAsyncImpl(clientOptions))
+                                    .params(params)
+                                    .response(it)
+                                    .build()
                             }
                     }
                 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/services/async/CreditNoteServiceAsyncImpl.kt b/orb-java-core/src/main/kotlin/com/withorb/api/services/async/CreditNoteServiceAsyncImpl.kt
index 891b2d6cf..1c25b2ee0 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/services/async/CreditNoteServiceAsyncImpl.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/services/async/CreditNoteServiceAsyncImpl.kt
@@ -115,11 +115,11 @@ class CreditNoteServiceAsyncImpl internal constructor(private val clientOptions:
                                 }
                             }
                             .let {
-                                CreditNoteListPageAsync.of(
-                                    CreditNoteServiceAsyncImpl(clientOptions),
-                                    params,
-                                    it,
-                                )
+                                CreditNoteListPageAsync.builder()
+                                    .service(CreditNoteServiceAsyncImpl(clientOptions))
+                                    .params(params)
+                                    .response(it)
+                                    .build()
                             }
                     }
                 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/services/async/CustomerServiceAsyncImpl.kt b/orb-java-core/src/main/kotlin/com/withorb/api/services/async/CustomerServiceAsyncImpl.kt
index 480be9063..7ed7766fb 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/services/async/CustomerServiceAsyncImpl.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/services/async/CustomerServiceAsyncImpl.kt
@@ -237,11 +237,11 @@ class CustomerServiceAsyncImpl internal constructor(private val clientOptions: C
                                 }
                             }
                             .let {
-                                CustomerListPageAsync.of(
-                                    CustomerServiceAsyncImpl(clientOptions),
-                                    params,
-                                    it,
-                                )
+                                CustomerListPageAsync.builder()
+                                    .service(CustomerServiceAsyncImpl(clientOptions))
+                                    .params(params)
+                                    .response(it)
+                                    .build()
                             }
                     }
                 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/services/async/DimensionalPriceGroupServiceAsyncImpl.kt b/orb-java-core/src/main/kotlin/com/withorb/api/services/async/DimensionalPriceGroupServiceAsyncImpl.kt
index d1f32baf5..b65239766 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/services/async/DimensionalPriceGroupServiceAsyncImpl.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/services/async/DimensionalPriceGroupServiceAsyncImpl.kt
@@ -166,11 +166,11 @@ internal constructor(private val clientOptions: ClientOptions) : DimensionalPric
                                 }
                             }
                             .let {
-                                DimensionalPriceGroupListPageAsync.of(
-                                    DimensionalPriceGroupServiceAsyncImpl(clientOptions),
-                                    params,
-                                    it,
-                                )
+                                DimensionalPriceGroupListPageAsync.builder()
+                                    .service(DimensionalPriceGroupServiceAsyncImpl(clientOptions))
+                                    .params(params)
+                                    .response(it)
+                                    .build()
                             }
                     }
                 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/services/async/InvoiceServiceAsyncImpl.kt b/orb-java-core/src/main/kotlin/com/withorb/api/services/async/InvoiceServiceAsyncImpl.kt
index ab74d7532..e63e0397c 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/services/async/InvoiceServiceAsyncImpl.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/services/async/InvoiceServiceAsyncImpl.kt
@@ -194,11 +194,11 @@ class InvoiceServiceAsyncImpl internal constructor(private val clientOptions: Cl
                                 }
                             }
                             .let {
-                                InvoiceListPageAsync.of(
-                                    InvoiceServiceAsyncImpl(clientOptions),
-                                    params,
-                                    it,
-                                )
+                                InvoiceListPageAsync.builder()
+                                    .service(InvoiceServiceAsyncImpl(clientOptions))
+                                    .params(params)
+                                    .response(it)
+                                    .build()
                             }
                     }
                 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/services/async/ItemServiceAsyncImpl.kt b/orb-java-core/src/main/kotlin/com/withorb/api/services/async/ItemServiceAsyncImpl.kt
index c8208fdf5..3bca007f3 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/services/async/ItemServiceAsyncImpl.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/services/async/ItemServiceAsyncImpl.kt
@@ -153,11 +153,11 @@ class ItemServiceAsyncImpl internal constructor(private val clientOptions: Clien
                                 }
                             }
                             .let {
-                                ItemListPageAsync.of(
-                                    ItemServiceAsyncImpl(clientOptions),
-                                    params,
-                                    it,
-                                )
+                                ItemListPageAsync.builder()
+                                    .service(ItemServiceAsyncImpl(clientOptions))
+                                    .params(params)
+                                    .response(it)
+                                    .build()
                             }
                     }
                 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/services/async/MetricServiceAsyncImpl.kt b/orb-java-core/src/main/kotlin/com/withorb/api/services/async/MetricServiceAsyncImpl.kt
index 9f5c70083..7fcfab11f 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/services/async/MetricServiceAsyncImpl.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/services/async/MetricServiceAsyncImpl.kt
@@ -153,11 +153,11 @@ class MetricServiceAsyncImpl internal constructor(private val clientOptions: Cli
                                 }
                             }
                             .let {
-                                MetricListPageAsync.of(
-                                    MetricServiceAsyncImpl(clientOptions),
-                                    params,
-                                    it,
-                                )
+                                MetricListPageAsync.builder()
+                                    .service(MetricServiceAsyncImpl(clientOptions))
+                                    .params(params)
+                                    .response(it)
+                                    .build()
                             }
                     }
                 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/services/async/PlanServiceAsyncImpl.kt b/orb-java-core/src/main/kotlin/com/withorb/api/services/async/PlanServiceAsyncImpl.kt
index 34d60774b..6ed6bd374 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/services/async/PlanServiceAsyncImpl.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/services/async/PlanServiceAsyncImpl.kt
@@ -167,11 +167,11 @@ class PlanServiceAsyncImpl internal constructor(private val clientOptions: Clien
                                 }
                             }
                             .let {
-                                PlanListPageAsync.of(
-                                    PlanServiceAsyncImpl(clientOptions),
-                                    params,
-                                    it,
-                                )
+                                PlanListPageAsync.builder()
+                                    .service(PlanServiceAsyncImpl(clientOptions))
+                                    .params(params)
+                                    .response(it)
+                                    .build()
                             }
                     }
                 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/services/async/PriceServiceAsyncImpl.kt b/orb-java-core/src/main/kotlin/com/withorb/api/services/async/PriceServiceAsyncImpl.kt
index c3224575b..0e1e32a6f 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/services/async/PriceServiceAsyncImpl.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/services/async/PriceServiceAsyncImpl.kt
@@ -177,11 +177,11 @@ class PriceServiceAsyncImpl internal constructor(private val clientOptions: Clie
                                 }
                             }
                             .let {
-                                PriceListPageAsync.of(
-                                    PriceServiceAsyncImpl(clientOptions),
-                                    params,
-                                    it,
-                                )
+                                PriceListPageAsync.builder()
+                                    .service(PriceServiceAsyncImpl(clientOptions))
+                                    .params(params)
+                                    .response(it)
+                                    .build()
                             }
                     }
                 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/services/async/SubscriptionServiceAsyncImpl.kt b/orb-java-core/src/main/kotlin/com/withorb/api/services/async/SubscriptionServiceAsyncImpl.kt
index 3ef14351b..add175fcb 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/services/async/SubscriptionServiceAsyncImpl.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/services/async/SubscriptionServiceAsyncImpl.kt
@@ -267,11 +267,11 @@ class SubscriptionServiceAsyncImpl internal constructor(private val clientOption
                                 }
                             }
                             .let {
-                                SubscriptionListPageAsync.of(
-                                    SubscriptionServiceAsyncImpl(clientOptions),
-                                    params,
-                                    it,
-                                )
+                                SubscriptionListPageAsync.builder()
+                                    .service(SubscriptionServiceAsyncImpl(clientOptions))
+                                    .params(params)
+                                    .response(it)
+                                    .build()
                             }
                     }
                 }
@@ -394,11 +394,11 @@ class SubscriptionServiceAsyncImpl internal constructor(private val clientOption
                                 }
                             }
                             .let {
-                                SubscriptionFetchSchedulePageAsync.of(
-                                    SubscriptionServiceAsyncImpl(clientOptions),
-                                    params,
-                                    it,
-                                )
+                                SubscriptionFetchSchedulePageAsync.builder()
+                                    .service(SubscriptionServiceAsyncImpl(clientOptions))
+                                    .params(params)
+                                    .response(it)
+                                    .build()
                             }
                     }
                 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/services/async/coupons/SubscriptionServiceAsyncImpl.kt b/orb-java-core/src/main/kotlin/com/withorb/api/services/async/coupons/SubscriptionServiceAsyncImpl.kt
index 50cd70121..f749a531e 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/services/async/coupons/SubscriptionServiceAsyncImpl.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/services/async/coupons/SubscriptionServiceAsyncImpl.kt
@@ -66,11 +66,11 @@ class SubscriptionServiceAsyncImpl internal constructor(private val clientOption
                                 }
                             }
                             .let {
-                                CouponSubscriptionListPageAsync.of(
-                                    SubscriptionServiceAsyncImpl(clientOptions),
-                                    params,
-                                    it,
-                                )
+                                CouponSubscriptionListPageAsync.builder()
+                                    .service(SubscriptionServiceAsyncImpl(clientOptions))
+                                    .params(params)
+                                    .response(it)
+                                    .build()
                             }
                     }
                 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/services/async/customers/BalanceTransactionServiceAsyncImpl.kt b/orb-java-core/src/main/kotlin/com/withorb/api/services/async/customers/BalanceTransactionServiceAsyncImpl.kt
index 1efbff97b..b2c2284d4 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/services/async/customers/BalanceTransactionServiceAsyncImpl.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/services/async/customers/BalanceTransactionServiceAsyncImpl.kt
@@ -108,11 +108,11 @@ internal constructor(private val clientOptions: ClientOptions) : BalanceTransact
                                 }
                             }
                             .let {
-                                CustomerBalanceTransactionListPageAsync.of(
-                                    BalanceTransactionServiceAsyncImpl(clientOptions),
-                                    params,
-                                    it,
-                                )
+                                CustomerBalanceTransactionListPageAsync.builder()
+                                    .service(BalanceTransactionServiceAsyncImpl(clientOptions))
+                                    .params(params)
+                                    .response(it)
+                                    .build()
                             }
                     }
                 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/services/async/customers/CreditServiceAsyncImpl.kt b/orb-java-core/src/main/kotlin/com/withorb/api/services/async/customers/CreditServiceAsyncImpl.kt
index 47c8154ca..39fad882b 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/services/async/customers/CreditServiceAsyncImpl.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/services/async/customers/CreditServiceAsyncImpl.kt
@@ -101,11 +101,11 @@ class CreditServiceAsyncImpl internal constructor(private val clientOptions: Cli
                                 }
                             }
                             .let {
-                                CustomerCreditListPageAsync.of(
-                                    CreditServiceAsyncImpl(clientOptions),
-                                    params,
-                                    it,
-                                )
+                                CustomerCreditListPageAsync.builder()
+                                    .service(CreditServiceAsyncImpl(clientOptions))
+                                    .params(params)
+                                    .response(it)
+                                    .build()
                             }
                     }
                 }
@@ -143,11 +143,11 @@ class CreditServiceAsyncImpl internal constructor(private val clientOptions: Cli
                                 }
                             }
                             .let {
-                                CustomerCreditListByExternalIdPageAsync.of(
-                                    CreditServiceAsyncImpl(clientOptions),
-                                    params,
-                                    it,
-                                )
+                                CustomerCreditListByExternalIdPageAsync.builder()
+                                    .service(CreditServiceAsyncImpl(clientOptions))
+                                    .params(params)
+                                    .response(it)
+                                    .build()
                             }
                     }
                 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/services/async/customers/credits/LedgerServiceAsyncImpl.kt b/orb-java-core/src/main/kotlin/com/withorb/api/services/async/customers/credits/LedgerServiceAsyncImpl.kt
index 7aa39f4d7..111daf6ab 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/services/async/customers/credits/LedgerServiceAsyncImpl.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/services/async/customers/credits/LedgerServiceAsyncImpl.kt
@@ -96,11 +96,11 @@ class LedgerServiceAsyncImpl internal constructor(private val clientOptions: Cli
                                 }
                             }
                             .let {
-                                CustomerCreditLedgerListPageAsync.of(
-                                    LedgerServiceAsyncImpl(clientOptions),
-                                    params,
-                                    it,
-                                )
+                                CustomerCreditLedgerListPageAsync.builder()
+                                    .service(LedgerServiceAsyncImpl(clientOptions))
+                                    .params(params)
+                                    .response(it)
+                                    .build()
                             }
                     }
                 }
@@ -211,11 +211,11 @@ class LedgerServiceAsyncImpl internal constructor(private val clientOptions: Cli
                                 }
                             }
                             .let {
-                                CustomerCreditLedgerListByExternalIdPageAsync.of(
-                                    LedgerServiceAsyncImpl(clientOptions),
-                                    params,
-                                    it,
-                                )
+                                CustomerCreditLedgerListByExternalIdPageAsync.builder()
+                                    .service(LedgerServiceAsyncImpl(clientOptions))
+                                    .params(params)
+                                    .response(it)
+                                    .build()
                             }
                     }
                 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/services/async/customers/credits/TopUpServiceAsyncImpl.kt b/orb-java-core/src/main/kotlin/com/withorb/api/services/async/customers/credits/TopUpServiceAsyncImpl.kt
index 2abbb3eda..09ca25318 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/services/async/customers/credits/TopUpServiceAsyncImpl.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/services/async/customers/credits/TopUpServiceAsyncImpl.kt
@@ -145,11 +145,11 @@ class TopUpServiceAsyncImpl internal constructor(private val clientOptions: Clie
                                 }
                             }
                             .let {
-                                CustomerCreditTopUpListPageAsync.of(
-                                    TopUpServiceAsyncImpl(clientOptions),
-                                    params,
-                                    it,
-                                )
+                                CustomerCreditTopUpListPageAsync.builder()
+                                    .service(TopUpServiceAsyncImpl(clientOptions))
+                                    .params(params)
+                                    .response(it)
+                                    .build()
                             }
                     }
                 }
@@ -283,11 +283,11 @@ class TopUpServiceAsyncImpl internal constructor(private val clientOptions: Clie
                                 }
                             }
                             .let {
-                                CustomerCreditTopUpListByExternalIdPageAsync.of(
-                                    TopUpServiceAsyncImpl(clientOptions),
-                                    params,
-                                    it,
-                                )
+                                CustomerCreditTopUpListByExternalIdPageAsync.builder()
+                                    .service(TopUpServiceAsyncImpl(clientOptions))
+                                    .params(params)
+                                    .response(it)
+                                    .build()
                             }
                     }
                 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/services/async/events/BackfillServiceAsyncImpl.kt b/orb-java-core/src/main/kotlin/com/withorb/api/services/async/events/BackfillServiceAsyncImpl.kt
index a9f522f94..cff62b177 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/services/async/events/BackfillServiceAsyncImpl.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/services/async/events/BackfillServiceAsyncImpl.kt
@@ -135,11 +135,11 @@ class BackfillServiceAsyncImpl internal constructor(private val clientOptions: C
                                 }
                             }
                             .let {
-                                EventBackfillListPageAsync.of(
-                                    BackfillServiceAsyncImpl(clientOptions),
-                                    params,
-                                    it,
-                                )
+                                EventBackfillListPageAsync.builder()
+                                    .service(BackfillServiceAsyncImpl(clientOptions))
+                                    .params(params)
+                                    .response(it)
+                                    .build()
                             }
                     }
                 }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/AlertServiceImpl.kt b/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/AlertServiceImpl.kt
index 85bed6a73..31e2fed93 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/AlertServiceImpl.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/AlertServiceImpl.kt
@@ -159,7 +159,13 @@ class AlertServiceImpl internal constructor(private val clientOptions: ClientOpt
                             it.validate()
                         }
                     }
-                    .let { AlertListPage.of(AlertServiceImpl(clientOptions), params, it) }
+                    .let {
+                        AlertListPage.builder()
+                            .service(AlertServiceImpl(clientOptions))
+                            .params(params)
+                            .response(it)
+                            .build()
+                    }
             }
         }
 
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/CouponServiceImpl.kt b/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/CouponServiceImpl.kt
index 9c51dfb87..517aa4ba6 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/CouponServiceImpl.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/CouponServiceImpl.kt
@@ -118,7 +118,13 @@ class CouponServiceImpl internal constructor(private val clientOptions: ClientOp
                             it.validate()
                         }
                     }
-                    .let { CouponListPage.of(CouponServiceImpl(clientOptions), params, it) }
+                    .let {
+                        CouponListPage.builder()
+                            .service(CouponServiceImpl(clientOptions))
+                            .params(params)
+                            .response(it)
+                            .build()
+                    }
             }
         }
 
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/CreditNoteServiceImpl.kt b/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/CreditNoteServiceImpl.kt
index 211aa5be0..a036d08b6 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/CreditNoteServiceImpl.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/CreditNoteServiceImpl.kt
@@ -105,7 +105,13 @@ class CreditNoteServiceImpl internal constructor(private val clientOptions: Clie
                             it.validate()
                         }
                     }
-                    .let { CreditNoteListPage.of(CreditNoteServiceImpl(clientOptions), params, it) }
+                    .let {
+                        CreditNoteListPage.builder()
+                            .service(CreditNoteServiceImpl(clientOptions))
+                            .params(params)
+                            .response(it)
+                            .build()
+                    }
             }
         }
 
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/CustomerServiceImpl.kt b/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/CustomerServiceImpl.kt
index 545211222..da329b172 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/CustomerServiceImpl.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/CustomerServiceImpl.kt
@@ -216,7 +216,13 @@ class CustomerServiceImpl internal constructor(private val clientOptions: Client
                             it.validate()
                         }
                     }
-                    .let { CustomerListPage.of(CustomerServiceImpl(clientOptions), params, it) }
+                    .let {
+                        CustomerListPage.builder()
+                            .service(CustomerServiceImpl(clientOptions))
+                            .params(params)
+                            .response(it)
+                            .build()
+                    }
             }
         }
 
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/DimensionalPriceGroupServiceImpl.kt b/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/DimensionalPriceGroupServiceImpl.kt
index 39ad5f9b1..5aef96249 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/DimensionalPriceGroupServiceImpl.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/DimensionalPriceGroupServiceImpl.kt
@@ -154,11 +154,11 @@ internal constructor(private val clientOptions: ClientOptions) : DimensionalPric
                         }
                     }
                     .let {
-                        DimensionalPriceGroupListPage.of(
-                            DimensionalPriceGroupServiceImpl(clientOptions),
-                            params,
-                            it,
-                        )
+                        DimensionalPriceGroupListPage.builder()
+                            .service(DimensionalPriceGroupServiceImpl(clientOptions))
+                            .params(params)
+                            .response(it)
+                            .build()
                     }
             }
         }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/InvoiceServiceImpl.kt b/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/InvoiceServiceImpl.kt
index 62401c8bf..9ca3b288d 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/InvoiceServiceImpl.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/InvoiceServiceImpl.kt
@@ -163,7 +163,13 @@ class InvoiceServiceImpl internal constructor(private val clientOptions: ClientO
                             it.validate()
                         }
                     }
-                    .let { InvoiceListPage.of(InvoiceServiceImpl(clientOptions), params, it) }
+                    .let {
+                        InvoiceListPage.builder()
+                            .service(InvoiceServiceImpl(clientOptions))
+                            .params(params)
+                            .response(it)
+                            .build()
+                    }
             }
         }
 
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/ItemServiceImpl.kt b/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/ItemServiceImpl.kt
index b69537f38..04065b321 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/ItemServiceImpl.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/ItemServiceImpl.kt
@@ -130,7 +130,13 @@ class ItemServiceImpl internal constructor(private val clientOptions: ClientOpti
                             it.validate()
                         }
                     }
-                    .let { ItemListPage.of(ItemServiceImpl(clientOptions), params, it) }
+                    .let {
+                        ItemListPage.builder()
+                            .service(ItemServiceImpl(clientOptions))
+                            .params(params)
+                            .response(it)
+                            .build()
+                    }
             }
         }
 
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/MetricServiceImpl.kt b/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/MetricServiceImpl.kt
index 36f676bcb..cc6119c69 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/MetricServiceImpl.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/MetricServiceImpl.kt
@@ -137,7 +137,13 @@ class MetricServiceImpl internal constructor(private val clientOptions: ClientOp
                             it.validate()
                         }
                     }
-                    .let { MetricListPage.of(MetricServiceImpl(clientOptions), params, it) }
+                    .let {
+                        MetricListPage.builder()
+                            .service(MetricServiceImpl(clientOptions))
+                            .params(params)
+                            .response(it)
+                            .build()
+                    }
             }
         }
 
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/PlanServiceImpl.kt b/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/PlanServiceImpl.kt
index 002b52448..a817592dc 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/PlanServiceImpl.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/PlanServiceImpl.kt
@@ -144,7 +144,13 @@ class PlanServiceImpl internal constructor(private val clientOptions: ClientOpti
                             it.validate()
                         }
                     }
-                    .let { PlanListPage.of(PlanServiceImpl(clientOptions), params, it) }
+                    .let {
+                        PlanListPage.builder()
+                            .service(PlanServiceImpl(clientOptions))
+                            .params(params)
+                            .response(it)
+                            .build()
+                    }
             }
         }
 
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/PriceServiceImpl.kt b/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/PriceServiceImpl.kt
index 3bcec6ac4..556cb014d 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/PriceServiceImpl.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/PriceServiceImpl.kt
@@ -154,7 +154,13 @@ class PriceServiceImpl internal constructor(private val clientOptions: ClientOpt
                             it.validate()
                         }
                     }
-                    .let { PriceListPage.of(PriceServiceImpl(clientOptions), params, it) }
+                    .let {
+                        PriceListPage.builder()
+                            .service(PriceServiceImpl(clientOptions))
+                            .params(params)
+                            .response(it)
+                            .build()
+                    }
             }
         }
 
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/SubscriptionServiceImpl.kt b/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/SubscriptionServiceImpl.kt
index 810703218..f327e26bb 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/SubscriptionServiceImpl.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/SubscriptionServiceImpl.kt
@@ -254,7 +254,11 @@ class SubscriptionServiceImpl internal constructor(private val clientOptions: Cl
                         }
                     }
                     .let {
-                        SubscriptionListPage.of(SubscriptionServiceImpl(clientOptions), params, it)
+                        SubscriptionListPage.builder()
+                            .service(SubscriptionServiceImpl(clientOptions))
+                            .params(params)
+                            .response(it)
+                            .build()
                     }
             }
         }
@@ -365,11 +369,11 @@ class SubscriptionServiceImpl internal constructor(private val clientOptions: Cl
                         }
                     }
                     .let {
-                        SubscriptionFetchSchedulePage.of(
-                            SubscriptionServiceImpl(clientOptions),
-                            params,
-                            it,
-                        )
+                        SubscriptionFetchSchedulePage.builder()
+                            .service(SubscriptionServiceImpl(clientOptions))
+                            .params(params)
+                            .response(it)
+                            .build()
                     }
             }
         }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/coupons/SubscriptionServiceImpl.kt b/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/coupons/SubscriptionServiceImpl.kt
index 72ccf4255..d19b9301f 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/coupons/SubscriptionServiceImpl.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/coupons/SubscriptionServiceImpl.kt
@@ -63,11 +63,11 @@ class SubscriptionServiceImpl internal constructor(private val clientOptions: Cl
                         }
                     }
                     .let {
-                        CouponSubscriptionListPage.of(
-                            SubscriptionServiceImpl(clientOptions),
-                            params,
-                            it,
-                        )
+                        CouponSubscriptionListPage.builder()
+                            .service(SubscriptionServiceImpl(clientOptions))
+                            .params(params)
+                            .response(it)
+                            .build()
                     }
             }
         }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/customers/BalanceTransactionServiceImpl.kt b/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/customers/BalanceTransactionServiceImpl.kt
index ad57833c1..f5b3f8885 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/customers/BalanceTransactionServiceImpl.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/customers/BalanceTransactionServiceImpl.kt
@@ -102,11 +102,11 @@ class BalanceTransactionServiceImpl internal constructor(private val clientOptio
                         }
                     }
                     .let {
-                        CustomerBalanceTransactionListPage.of(
-                            BalanceTransactionServiceImpl(clientOptions),
-                            params,
-                            it,
-                        )
+                        CustomerBalanceTransactionListPage.builder()
+                            .service(BalanceTransactionServiceImpl(clientOptions))
+                            .params(params)
+                            .response(it)
+                            .build()
                     }
             }
         }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/customers/CreditServiceImpl.kt b/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/customers/CreditServiceImpl.kt
index 4be4dbfc8..421613a6f 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/customers/CreditServiceImpl.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/customers/CreditServiceImpl.kt
@@ -97,7 +97,13 @@ class CreditServiceImpl internal constructor(private val clientOptions: ClientOp
                             it.validate()
                         }
                     }
-                    .let { CustomerCreditListPage.of(CreditServiceImpl(clientOptions), params, it) }
+                    .let {
+                        CustomerCreditListPage.builder()
+                            .service(CreditServiceImpl(clientOptions))
+                            .params(params)
+                            .response(it)
+                            .build()
+                    }
             }
         }
 
@@ -131,11 +137,11 @@ class CreditServiceImpl internal constructor(private val clientOptions: ClientOp
                         }
                     }
                     .let {
-                        CustomerCreditListByExternalIdPage.of(
-                            CreditServiceImpl(clientOptions),
-                            params,
-                            it,
-                        )
+                        CustomerCreditListByExternalIdPage.builder()
+                            .service(CreditServiceImpl(clientOptions))
+                            .params(params)
+                            .response(it)
+                            .build()
                     }
             }
         }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/customers/credits/LedgerServiceImpl.kt b/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/customers/credits/LedgerServiceImpl.kt
index 373c45110..25a4c60b8 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/customers/credits/LedgerServiceImpl.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/customers/credits/LedgerServiceImpl.kt
@@ -93,11 +93,11 @@ class LedgerServiceImpl internal constructor(private val clientOptions: ClientOp
                         }
                     }
                     .let {
-                        CustomerCreditLedgerListPage.of(
-                            LedgerServiceImpl(clientOptions),
-                            params,
-                            it,
-                        )
+                        CustomerCreditLedgerListPage.builder()
+                            .service(LedgerServiceImpl(clientOptions))
+                            .params(params)
+                            .response(it)
+                            .build()
                     }
             }
         }
@@ -199,11 +199,11 @@ class LedgerServiceImpl internal constructor(private val clientOptions: ClientOp
                         }
                     }
                     .let {
-                        CustomerCreditLedgerListByExternalIdPage.of(
-                            LedgerServiceImpl(clientOptions),
-                            params,
-                            it,
-                        )
+                        CustomerCreditLedgerListByExternalIdPage.builder()
+                            .service(LedgerServiceImpl(clientOptions))
+                            .params(params)
+                            .response(it)
+                            .build()
                     }
             }
         }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/customers/credits/TopUpServiceImpl.kt b/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/customers/credits/TopUpServiceImpl.kt
index 5051e0e9a..626104a6e 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/customers/credits/TopUpServiceImpl.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/customers/credits/TopUpServiceImpl.kt
@@ -138,7 +138,11 @@ class TopUpServiceImpl internal constructor(private val clientOptions: ClientOpt
                         }
                     }
                     .let {
-                        CustomerCreditTopUpListPage.of(TopUpServiceImpl(clientOptions), params, it)
+                        CustomerCreditTopUpListPage.builder()
+                            .service(TopUpServiceImpl(clientOptions))
+                            .params(params)
+                            .response(it)
+                            .build()
                     }
             }
         }
@@ -260,11 +264,11 @@ class TopUpServiceImpl internal constructor(private val clientOptions: ClientOpt
                         }
                     }
                     .let {
-                        CustomerCreditTopUpListByExternalIdPage.of(
-                            TopUpServiceImpl(clientOptions),
-                            params,
-                            it,
-                        )
+                        CustomerCreditTopUpListByExternalIdPage.builder()
+                            .service(TopUpServiceImpl(clientOptions))
+                            .params(params)
+                            .response(it)
+                            .build()
                     }
             }
         }
diff --git a/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/events/BackfillServiceImpl.kt b/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/events/BackfillServiceImpl.kt
index 7de1684e2..5f2af3181 100644
--- a/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/events/BackfillServiceImpl.kt
+++ b/orb-java-core/src/main/kotlin/com/withorb/api/services/blocking/events/BackfillServiceImpl.kt
@@ -129,7 +129,11 @@ class BackfillServiceImpl internal constructor(private val clientOptions: Client
                         }
                     }
                     .let {
-                        EventBackfillListPage.of(BackfillServiceImpl(clientOptions), params, it)
+                        EventBackfillListPage.builder()
+                            .service(BackfillServiceImpl(clientOptions))
+                            .params(params)
+                            .response(it)
+                            .build()
                     }
             }
         }