diff --git a/modules/ppcp-settings/resources/js/data/common/constants.js b/modules/ppcp-settings/resources/js/data/common/constants.js
index 6101ed31a..9faa698e5 100644
--- a/modules/ppcp-settings/resources/js/data/common/constants.js
+++ b/modules/ppcp-settings/resources/js/data/common/constants.js
@@ -46,14 +46,15 @@ export const REST_DIRECT_AUTHENTICATION_PATH =
 	'/wc/v3/wc_paypal/authenticate/direct';
 
 /**
- * REST path to perform the ISU authentication check, using shared ID and authCode.
+ * REST path to perform the OAuth authentication check, using shared ID and authCode.
  *
  * Used by: Controls
  * See: AuthenticateRestEndpoint.php
  *
  * @type {string}
  */
-export const REST_ISU_AUTHENTICATION_PATH = '/wc/v3/wc_paypal/authenticate/isu';
+export const REST_OAUTH_AUTHENTICATION_PATH =
+	'/wc/v3/wc_paypal/authenticate/oauth';
 
 /**
  * REST path to generate an ISU URL for the PayPal-login.
diff --git a/modules/ppcp-settings/resources/js/data/common/controls.js b/modules/ppcp-settings/resources/js/data/common/controls.js
index 62d4a8f84..dc2f04710 100644
--- a/modules/ppcp-settings/resources/js/data/common/controls.js
+++ b/modules/ppcp-settings/resources/js/data/common/controls.js
@@ -15,7 +15,7 @@ import {
 	REST_CONNECTION_URL_PATH,
 	REST_HYDRATE_MERCHANT_PATH,
 	REST_REFRESH_FEATURES_PATH,
-	REST_ISU_AUTHENTICATION_PATH,
+	REST_OAUTH_AUTHENTICATION_PATH,
 	REST_WEBHOOKS,
 	REST_WEBHOOKS_SIMULATE,
 } from './constants';
@@ -82,7 +82,7 @@ export const controls = {
 	} ) {
 		try {
 			return await apiFetch( {
-				path: REST_ISU_AUTHENTICATION_PATH,
+				path: REST_OAUTH_AUTHENTICATION_PATH,
 				method: 'POST',
 				data: {
 					sharedId,
diff --git a/modules/ppcp-settings/src/Endpoint/AuthenticationRestEndpoint.php b/modules/ppcp-settings/src/Endpoint/AuthenticationRestEndpoint.php
index 5ffd48baa..7ac964b2d 100644
--- a/modules/ppcp-settings/src/Endpoint/AuthenticationRestEndpoint.php
+++ b/modules/ppcp-settings/src/Endpoint/AuthenticationRestEndpoint.php
@@ -106,7 +106,7 @@ class AuthenticationRestEndpoint extends RestEndpoint {
 		);
 
 		/**
-		 * POST /wp-json/wc/v3/wc_paypal/authenticate/isu
+		 * POST /wp-json/wc/v3/wc_paypal/authenticate/oauth
 		 * {
 		 *     sharedId
 		 *     authCode
@@ -115,10 +115,10 @@ class AuthenticationRestEndpoint extends RestEndpoint {
 		 */
 		register_rest_route(
 			$this->namespace,
-			'/' . $this->rest_base . '/isu',
+			'/' . $this->rest_base . '/oauth',
 			array(
 				'methods'             => WP_REST_Server::EDITABLE,
-				'callback'            => array( $this, 'connect_isu' ),
+				'callback'            => array( $this, 'connect_oauth' ),
 				'permission_callback' => array( $this, 'check_permission' ),
 				'args'                => array(
 					'sharedId'   => array(
@@ -181,14 +181,14 @@ class AuthenticationRestEndpoint extends RestEndpoint {
 	}
 
 	/**
-	 * ISU login: Retrieves clientId and clientSecret using a sharedId and authCode.
+	 * OAuth login: Retrieves clientId and clientSecret using a sharedId and authCode.
 	 *
-	 * This is the final step in the UI-driven login via the ISU popup, which
+	 * This is the final step in the UI-driven login via the OAuth popup, which
 	 * is triggered by the LoginLinkRestEndpoint URL.
 	 *
 	 * @param WP_REST_Request $request Full data about the request.
 	 */
-	public function connect_isu( WP_REST_Request $request ) : WP_REST_Response {
+	public function connect_oauth( WP_REST_Request $request ) : WP_REST_Response {
 		$shared_id   = $request->get_param( 'sharedId' );
 		$auth_code   = $request->get_param( 'authCode' );
 		$use_sandbox = $request->get_param( 'useSandbox' );