diff --git a/package.json b/package.json
index bbe30abc9b3..59afcbc2640 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,7 @@
     "test": "pnpm turbo test --concurrency=1",
     "test:production": "pnpm turbo test:production --concurrency=1",
     "test:try-one": "pnpm --filter main-test-app run test:try-one",
-    "test:docs": "pnpm build:docs && pnpm run -r --workspace-concurrency=-1 --if-present test:blueprints",
+    "test:docs": "pnpm build:docs && pnpm run -r --workspace-concurrency=-1 --if-present test:docs",
     "test:blueprints": "pnpm run -r --workspace-concurrency=-1 --if-present test:blueprints",
     "test:fastboot": "pnpm run -r --workspace-concurrency=-1 --if-present test:fastboot",
     "test:embroider": "pnpm run -r ---workspace-concurrency=-1 --if-present test:embroider",
diff --git a/packages/-ember-data/addon/store.ts b/packages/-ember-data/addon/store.ts
index 4236139c53a..320780c8a6c 100644
--- a/packages/-ember-data/addon/store.ts
+++ b/packages/-ember-data/addon/store.ts
@@ -21,13 +21,20 @@ import type { Cache } from '@warp-drive/core-types/cache';
 import type { CacheCapabilitiesManager } from '@ember-data/store/-types/q/cache-store-wrapper';
 import type { ModelSchema } from '@ember-data/store/-types/q/ds-model';
 
+function hasRequestManager(store: BaseStore): boolean {
+  return 'requestManager' in store;
+}
+
 export default class Store extends BaseStore {
   declare _fetchManager: FetchManager;
 
   constructor(args?: Record<string, unknown>) {
     super(args);
-    this.requestManager = new RequestManager();
-    this.requestManager.use([LegacyNetworkHandler, Fetch]);
+
+    if (!hasRequestManager(this)) {
+      this.requestManager = new RequestManager();
+      this.requestManager.use([LegacyNetworkHandler, Fetch]);
+    }
     this.requestManager.useCache(CacheHandler);
     this.registerSchema(buildSchema(this));
   }
diff --git a/packages/json-api/src/-private/builders/-utils.ts b/packages/json-api/src/-private/builders/-utils.ts
index 9cae4d3439b..7e1488bbd99 100644
--- a/packages/json-api/src/-private/builders/-utils.ts
+++ b/packages/json-api/src/-private/builders/-utils.ts
@@ -1,6 +1,90 @@
+/**
+ * @module @ember-data/json-api/request
+ */
+import { BuildURLConfig, setBuildURLConfig as setConfig } from '@ember-data/request-utils';
 import { type UrlOptions } from '@ember-data/request-utils';
 import type { CacheOptions, ConstrainedRequestOptions } from '@warp-drive/core-types/request';
 
+export interface JSONAPIConfig extends BuildURLConfig {
+  profiles?: {
+    pagination?: string;
+    [key: string]: string | undefined;
+  };
+  extensions?: {
+    atomic?: string;
+    [key: string]: string | undefined;
+  };
+}
+
+const JsonApiAccept = 'application/vnd.api+json';
+const DEFAULT_CONFIG: JSONAPIConfig = { host: '', namespace: '' };
+export let CONFIG: JSONAPIConfig = DEFAULT_CONFIG;
+export let ACCEPT_HEADER_VALUE = 'application/vnd.api+json';
+
+/**
+ * Allows setting extensions and profiles to be used in the `Accept` header.
+ *
+ * Extensions and profiles are keyed by their namespace with the value being
+ * their URI.
+ *
+ * Example:
+ *
+ * ```ts
+ * setBuildURLConfig({
+ *   extensions: {
+ *     atomic: 'https://jsonapi.org/ext/atomic'
+ *   },
+ *   profiles: {
+ *     pagination: 'https://jsonapi.org/profiles/ethanresnick/cursor-pagination'
+ *   }
+ * });
+ *
+ * This also sets the global configuration for `buildBaseURL`
+ * for host and namespace values for the application
+ * in the `@ember-data/request-utils` package.
+ *
+ * These values may still be overridden by passing
+ * them to buildBaseURL directly.
+ *
+ * This method may be called as many times as needed
+ *
+ * ```ts
+ * type BuildURLConfig = {
+ *   host: string;
+ *   namespace: string'
+ * }
+ * ```
+ *
+ * @method setBuildURLConfig
+ * @static
+ * @public
+ * @for @ember-data/json-api/request
+ * @param {BuildURLConfig} config
+ * @returns void
+ */
+export function setBuildURLConfig(config: JSONAPIConfig): void {
+  CONFIG = Object.assign({}, DEFAULT_CONFIG, config);
+
+  if (config.profiles || config.extensions) {
+    let accept = JsonApiAccept;
+    if (config.profiles) {
+      const profiles = Object.values(config.profiles);
+      if (profiles.length) {
+        accept += ';profile="' + profiles.join(' ') + '"';
+      }
+    }
+    if (config.extensions) {
+      const extensions = Object.values(config.extensions);
+      if (extensions.length) {
+        accept += ';ext=' + extensions.join(' ');
+      }
+    }
+    ACCEPT_HEADER_VALUE = accept;
+  }
+
+  setConfig(config);
+}
+
 export function copyForwardUrlOptions(urlOptions: UrlOptions, options: ConstrainedRequestOptions): void {
   if ('host' in options) {
     urlOptions.host = options.host;
diff --git a/packages/json-api/src/-private/builders/find-record.ts b/packages/json-api/src/-private/builders/find-record.ts
index 02b87a878db..6f8c075c242 100644
--- a/packages/json-api/src/-private/builders/find-record.ts
+++ b/packages/json-api/src/-private/builders/find-record.ts
@@ -10,7 +10,7 @@ import type {
   RemotelyAccessibleIdentifier,
 } from '@warp-drive/core-types/request';
 
-import { copyForwardUrlOptions, extractCacheOptions } from './-utils';
+import { ACCEPT_HEADER_VALUE, copyForwardUrlOptions, extractCacheOptions } from './-utils';
 
 /**
  * Builds request options to fetch a single resource by a known id or identifier
@@ -93,7 +93,7 @@ export function findRecord(
 
   const url = buildBaseURL(urlOptions);
   const headers = new Headers();
-  headers.append('Accept', 'application/vnd.api+json');
+  headers.append('Accept', ACCEPT_HEADER_VALUE);
 
   return {
     url: options.include?.length
diff --git a/packages/json-api/src/-private/builders/query.ts b/packages/json-api/src/-private/builders/query.ts
index 234fe64cdbe..04221d2eccf 100644
--- a/packages/json-api/src/-private/builders/query.ts
+++ b/packages/json-api/src/-private/builders/query.ts
@@ -12,7 +12,7 @@ import type {
   QueryRequestOptions,
 } from '@warp-drive/core-types/request';
 
-import { copyForwardUrlOptions, extractCacheOptions } from './-utils';
+import { ACCEPT_HEADER_VALUE, copyForwardUrlOptions, extractCacheOptions } from './-utils';
 
 /**
  * Builds request options to query for resources, usually by a primary
@@ -85,7 +85,7 @@ export function query(
 
   const url = buildBaseURL(urlOptions);
   const headers = new Headers();
-  headers.append('Accept', 'application/vnd.api+json');
+  headers.append('Accept', ACCEPT_HEADER_VALUE);
 
   return {
     url: `${url}?${buildQueryParams(query, options.urlParamsSettings)}`,
@@ -160,7 +160,7 @@ export function postQuery(
 
   const url = buildBaseURL(urlOptions);
   const headers = new Headers();
-  headers.append('Accept', 'application/vnd.api+json');
+  headers.append('Accept', ACCEPT_HEADER_VALUE);
 
   const queryData = structuredClone(query);
   cacheOptions.key = cacheOptions.key ?? `${url}?${buildQueryParams(queryData, options.urlParamsSettings)}`;
diff --git a/packages/json-api/src/-private/builders/save-record.ts b/packages/json-api/src/-private/builders/save-record.ts
index 1f91b816f7e..5b4073e9be7 100644
--- a/packages/json-api/src/-private/builders/save-record.ts
+++ b/packages/json-api/src/-private/builders/save-record.ts
@@ -17,7 +17,7 @@ import {
   UpdateRequestOptions,
 } from '@warp-drive/core-types/request';
 
-import { copyForwardUrlOptions } from './-utils';
+import { ACCEPT_HEADER_VALUE, copyForwardUrlOptions } from './-utils';
 
 function isExisting(identifier: StableRecordIdentifier): identifier is StableExistingRecordIdentifier {
   return 'id' in identifier && identifier.id !== null && 'type' in identifier && identifier.type !== null;
@@ -90,7 +90,7 @@ export function deleteRecord(record: unknown, options: ConstrainedRequestOptions
 
   const url = buildBaseURL(urlOptions);
   const headers = new Headers();
-  headers.append('Accept', 'application/vnd.api+json');
+  headers.append('Accept', ACCEPT_HEADER_VALUE);
 
   return {
     url,
@@ -159,7 +159,7 @@ export function createRecord(record: unknown, options: ConstrainedRequestOptions
 
   const url = buildBaseURL(urlOptions);
   const headers = new Headers();
-  headers.append('Accept', 'application/vnd.api+json');
+  headers.append('Accept', ACCEPT_HEADER_VALUE);
 
   return {
     url,
@@ -235,7 +235,7 @@ export function updateRecord(
 
   const url = buildBaseURL(urlOptions);
   const headers = new Headers();
-  headers.append('Accept', 'application/vnd.api+json');
+  headers.append('Accept', ACCEPT_HEADER_VALUE);
 
   return {
     url,
diff --git a/packages/json-api/src/request.ts b/packages/json-api/src/request.ts
index b664706957e..29bc57b79a8 100644
--- a/packages/json-api/src/request.ts
+++ b/packages/json-api/src/request.ts
@@ -67,3 +67,4 @@ export { findRecord } from './-private/builders/find-record';
 export { query, postQuery } from './-private/builders/query';
 export { deleteRecord, createRecord, updateRecord } from './-private/builders/save-record';
 export { serializeResources, serializePatch } from './-private/serialize';
+export { setBuildURLConfig } from './-private/builders/-utils';
diff --git a/packages/request-utils/src/index.ts b/packages/request-utils/src/index.ts
index 0a18cb127f8..609db561e51 100644
--- a/packages/request-utils/src/index.ts
+++ b/packages/request-utils/src/index.ts
@@ -52,7 +52,7 @@ type Store = {
 // host and namespace which are provided by the final consuming
 // class to the prototype which can result in overwrite errors
 
-interface BuildURLConfig {
+export interface BuildURLConfig {
   host: string | null;
   namespace: string | null;
 }
diff --git a/tests/docs/fixtures/expected.js b/tests/docs/fixtures/expected.js
index 86dd5dd55a7..29b28cf9f60 100644
--- a/tests/docs/fixtures/expected.js
+++ b/tests/docs/fixtures/expected.js
@@ -260,6 +260,7 @@ module.exports = {
     '(public) @ember-data/json-api/request @ember-data/json-api/request#updateRecord',
     '(public) @ember-data/json-api/request @ember-data/json-api/request#serializePatch',
     '(public) @ember-data/json-api/request @ember-data/json-api/request#serializeResources',
+    '(public) @ember-data/json-api/request @ember-data/json-api/request#setBuildURLConfig',
     '(public) @ember-data/legacy-compat SnapshotRecordArray#adapterOptions',
     '(public) @ember-data/legacy-compat SnapshotRecordArray#include',
     '(public) @ember-data/legacy-compat SnapshotRecordArray#length',
diff --git a/tests/main/tests/integration/store-extension-test.ts b/tests/main/tests/integration/store-extension-test.ts
new file mode 100644
index 00000000000..75610eb0735
--- /dev/null
+++ b/tests/main/tests/integration/store-extension-test.ts
@@ -0,0 +1,48 @@
+import { module, test } from 'qunit';
+import { setupTest } from 'ember-qunit';
+import Store from 'ember-data/store';
+import RequestManager from '@ember-data/request';
+import { inject as service } from '@ember/service';
+
+module('Integration | Store Extension', function (hooks) {
+  setupTest(hooks);
+
+  test('We can create a store ', function (assert) {
+    const { owner } = this;
+    class CustomStore extends Store {}
+    owner.register('service:store', CustomStore);
+    const store = owner.lookup('service:store');
+
+    assert.true(
+      store.requestManager instanceof RequestManager,
+      'We create a request manager for the store automatically'
+    );
+  });
+
+  test('We can create a store with a custom request manager injected as a service', function (assert) {
+    const { owner } = this;
+    class CustomStore extends Store {
+      @service requestManager!: RequestManager;
+    }
+
+    owner.register('service:store', CustomStore);
+    owner.register('service:request-manager', RequestManager);
+    const requestManager = owner.lookup('service:request-manager');
+    const store = owner.lookup('service:store');
+
+    assert.true(store.requestManager === requestManager, 'We can inject a custom request manager into the store');
+  });
+
+  test('We can create a store with a custom request manager initialized as a field', function (assert) {
+    const { owner } = this;
+    const requestManager = new RequestManager();
+    class CustomStore extends Store {
+      requestManager = requestManager;
+    }
+
+    owner.register('service:store', CustomStore);
+    const store = owner.lookup('service:store');
+
+    assert.true(store.requestManager === requestManager, 'We can inject a custom request manager into the store');
+  });
+});