diff --git a/plugins/image-prioritizer/helper.php b/plugins/image-prioritizer/helper.php
index c7f95c9901..998a27a2f4 100644
--- a/plugins/image-prioritizer/helper.php
+++ b/plugins/image-prioritizer/helper.php
@@ -298,7 +298,7 @@ function image_prioritizer_filter_rest_request_before_callbacks( $response, arra
 		$request->get_method() !== 'POST'
 		||
 		// The strtolower() and outer trim are due to \WP_REST_Server::match_request_to_handler() using case-insensitive pattern match and using '$' instead of '\z'.
-		OD_Rest_API::OD_REST_API_NAMESPACE . OD_Rest_API::OD_URL_METRICS_ROUTE !== rtrim( strtolower( ltrim( $request->get_route(), '/' ) ) )
+		OD_REST_API_NAMESPACE . OD_URL_METRICS_ROUTE !== rtrim( strtolower( ltrim( $request->get_route(), '/' ) ) )
 	) {
 		return $response;
 	}
diff --git a/plugins/image-prioritizer/tests/test-helper.php b/plugins/image-prioritizer/tests/test-helper.php
index ff164afe63..79a4092c41 100644
--- a/plugins/image-prioritizer/tests/test-helper.php
+++ b/plugins/image-prioritizer/tests/test-helper.php
@@ -727,7 +727,7 @@ public function data_provider_to_test_image_prioritizer_filter_rest_request_befo
 		};
 
 		$create_request = static function ( array $url_metric_data ): WP_REST_Request {
-			$request = new WP_REST_Request( 'POST', '/' . OD_Rest_API::OD_REST_API_NAMESPACE . OD_Rest_API::OD_URL_METRICS_ROUTE );
+			$request = new WP_REST_Request( 'POST', '/' . OD_REST_API_NAMESPACE . OD_URL_METRICS_ROUTE );
 			$request->set_header( 'content-type', 'application/json' );
 			$request->set_body( wp_json_encode( $url_metric_data ) );
 			return $request;
diff --git a/plugins/optimization-detective/deprecated.php b/plugins/optimization-detective/deprecated.php
new file mode 100644
index 0000000000..a23b724a2d
--- /dev/null
+++ b/plugins/optimization-detective/deprecated.php
@@ -0,0 +1,39 @@
+<?php
+/**
+ * Deprecated functions and constants.
+ *
+ * @package optimization-detective
+ *
+ * @since n.e.x.t
+ */
+
+// @codeCoverageIgnoreStart
+if ( ! defined( 'ABSPATH' ) ) {
+	exit; // Exit if accessed directly.
+}
+
+/**
+ * Namespace for optimization-detective.
+ *
+ * @since 0.1.0
+ * @access private
+ * @deprecated n.e.x.t This constant should not be used, instead use OD_Rest_API::get_namespace() method.
+ * @var string
+ */
+const OD_REST_API_NAMESPACE = 'optimization-detective/v1';
+
+/**
+ * Route for storing a URL Metric.
+ *
+ * Note the `:store` art of the endpoint follows Google's guidance in AIP-136 for the use of the POST method in a way
+ * that does not strictly follow the standard usage. Namely, submitting a POST request to this endpoint will either
+ * create a new `od_url_metrics` post, or it will update an existing post if one already exists for the provided slug.
+ *
+ * @since 0.1.0
+ * @access private
+ * @link https://google.aip.dev/136
+ * @deprecated n.e.x.t This constant should not be used, instead use OD_Rest_API::get_route() method.
+ * @var string
+ */
+const OD_URL_METRICS_ROUTE = '/url-metrics:store';
+// @codeCoverageIgnoreEnd
diff --git a/plugins/optimization-detective/detection.php b/plugins/optimization-detective/detection.php
index 55c3cd14ab..ed121fe57a 100644
--- a/plugins/optimization-detective/detection.php
+++ b/plugins/optimization-detective/detection.php
@@ -121,7 +121,7 @@ function od_get_detection_script( string $slug, OD_URL_Metric_Group_Collection $
 		'maxViewportAspectRatio' => od_get_maximum_viewport_aspect_ratio(),
 		'isDebug'                => WP_DEBUG,
 		'extensionModuleUrls'    => $extension_module_urls,
-		'restApiEndpoint'        => rest_url( OD_Rest_API::OD_REST_API_NAMESPACE . OD_Rest_API::OD_URL_METRICS_ROUTE ),
+		'restApiEndpoint'        => rest_url( OD_Rest_API::get_namespace() . OD_Rest_API::get_route() ),
 		'currentETag'            => $current_etag,
 		'currentUrl'             => $current_url,
 		'urlMetricSlug'          => $slug,
diff --git a/plugins/optimization-detective/load.php b/plugins/optimization-detective/load.php
index ff8870cca6..0c637147ac 100644
--- a/plugins/optimization-detective/load.php
+++ b/plugins/optimization-detective/load.php
@@ -99,6 +99,9 @@ static function ( string $version ): void {
 
 		require_once __DIR__ . '/helper.php';
 
+		// Deprecations.
+		require_once __DIR__ . '/deprecated.php';
+
 		// Core infrastructure classes.
 		require_once __DIR__ . '/class-od-data-validation-exception.php';
 		require_once __DIR__ . '/class-od-html-tag-processor.php';
diff --git a/plugins/optimization-detective/site-health.php b/plugins/optimization-detective/site-health.php
index a5ae5ed946..cdbbcc17ac 100644
--- a/plugins/optimization-detective/site-health.php
+++ b/plugins/optimization-detective/site-health.php
@@ -91,7 +91,7 @@ function od_compose_site_health_result( $response ): array {
 		sprintf(
 			/* translators: %s is the REST API endpoint */
 			__( 'To collect URL Metrics from visitors the REST API must be available to unauthenticated users. Specifically, visitors must be able to perform a <code>POST</code> request to the <code>%s</code> endpoint.', 'optimization-detective' ),
-			'/' . OD_Rest_API::OD_REST_API_NAMESPACE . OD_Rest_API::OD_URL_METRICS_ROUTE
+			'/' . OD_Rest_API::get_namespace() . OD_Rest_API::get_route()
 		),
 		array( 'code' => array() )
 	) . '</p>';
@@ -192,7 +192,7 @@ function od_get_rest_api_health_check_response( bool $use_cached ) {
 	if ( false !== $response ) {
 		return $response;
 	}
-	$rest_url = get_rest_url( null, OD_Rest_API::OD_REST_API_NAMESPACE . OD_Rest_API::OD_URL_METRICS_ROUTE );
+	$rest_url = get_rest_url( null, OD_Rest_API::get_namespace() . OD_Rest_API::get_route() );
 	$response = wp_remote_post(
 		$rest_url,
 		array(
diff --git a/plugins/optimization-detective/storage/class-od-rest-api.php b/plugins/optimization-detective/storage/class-od-rest-api.php
index e338f48672..d423c8baff 100644
--- a/plugins/optimization-detective/storage/class-od-rest-api.php
+++ b/plugins/optimization-detective/storage/class-od-rest-api.php
@@ -52,6 +52,28 @@ public static function add_hooks(): void {
 		add_action( 'rest_api_init', array( __CLASS__, 'od_register_endpoint' ) );
 	}
 
+	/**
+	 * Get the namespace for optimization-detective
+	 *
+	 * @since n.e.x.t
+	 * @access private
+	 * @return string
+	 */
+	public static function get_namespace(): string {
+		return self::OD_REST_API_NAMESPACE;
+	}
+
+	/**
+	 * Get the route for storing URL metric.
+	 *
+	 * @since n.e.x.t
+	 * @access private
+	 * @return string
+	 */
+	public static function get_route(): string {
+		return self::OD_URL_METRICS_ROUTE;
+	}
+
 	/**
 	 * Registers endpoint for storage of URL Metric.
 	 *
@@ -102,8 +124,8 @@ public static function od_register_endpoint(): void {
 		);
 
 		register_rest_route(
-			self::OD_REST_API_NAMESPACE,
-			self::OD_URL_METRICS_ROUTE,
+			self::get_namespace(),
+			self::get_route(),
 			array(
 				'methods'             => 'POST',
 				'args'                => array_merge(
diff --git a/plugins/optimization-detective/tests/storage/test-class-od-rest-api.php b/plugins/optimization-detective/tests/storage/test-class-od-rest-api.php
index c36d0d76b2..04145e89c3 100644
--- a/plugins/optimization-detective/tests/storage/test-class-od-rest-api.php
+++ b/plugins/optimization-detective/tests/storage/test-class-od-rest-api.php
@@ -32,6 +32,32 @@ public function test_add_hooks(): void {
 		);
 	}
 
+	/**
+	 * Test get_namespace().
+	 *
+	 * @covers OD_Rest_API::get_namespace
+	 */
+	public function test_get_namespace(): void {
+
+		$expected = 'optimization-detective/v1';
+		$actual   = OD_Rest_API::get_namespace();
+
+		$this->assertSame( $expected, $actual );
+	}
+
+	/**
+	 * Test get_route().
+	 *
+	 * @covers OD_Rest_API::get_route
+	 */
+	public function test_get_route(): void {
+
+		$expected = '/url-metrics:store';
+		$actual   = OD_Rest_API::get_route();
+
+		$this->assertSame( $expected, $actual );
+	}
+
 	/**
 	 * Data provider.
 	 *
diff --git a/plugins/optimization-detective/tests/test-site-health.php b/plugins/optimization-detective/tests/test-site-health.php
index d80732e08e..f8e633096d 100644
--- a/plugins/optimization-detective/tests/test-site-health.php
+++ b/plugins/optimization-detective/tests/test-site-health.php
@@ -420,7 +420,7 @@ protected function filter_rest_api_response( $mocked_response ): object {
 		add_filter(
 			'pre_http_request',
 			static function ( $pre, array $args, string $url ) use ( $mocked_response, $observer ) {
-				if ( rest_url( OD_Rest_API::OD_REST_API_NAMESPACE . OD_Rest_API::OD_URL_METRICS_ROUTE ) === $url ) {
+				if ( rest_url( OD_Rest_API::get_namespace() . OD_Rest_API::get_route() ) === $url ) {
 					$observer->counter++;
 					return $mocked_response;
 				}