diff --git a/modules/ppcp-settings/src/Endpoint/CommonRestEndpoint.php b/modules/ppcp-settings/src/Endpoint/CommonRestEndpoint.php
index 18c9de902..c7345148e 100644
--- a/modules/ppcp-settings/src/Endpoint/CommonRestEndpoint.php
+++ b/modules/ppcp-settings/src/Endpoint/CommonRestEndpoint.php
@@ -109,11 +109,7 @@ class CommonRestEndpoint extends RestEndpoint {
 			$this->field_map
 		);
 
-		return rest_ensure_response(
-			array(
-				'data' => $js_data,
-			)
-		);
+		return $this->return_success( $js_data );
 	}
 
 	/**
diff --git a/modules/ppcp-settings/src/Endpoint/ConnectManualRestEndpoint.php b/modules/ppcp-settings/src/Endpoint/ConnectManualRestEndpoint.php
index 5225b4d13..e394b880b 100644
--- a/modules/ppcp-settings/src/Endpoint/ConnectManualRestEndpoint.php
+++ b/modules/ppcp-settings/src/Endpoint/ConnectManualRestEndpoint.php
@@ -126,33 +126,22 @@ class ConnectManualRestEndpoint extends RestEndpoint {
 		$use_sandbox   = (bool) ( $data['use_sandbox'] ?? false );
 
 		if ( empty( $client_id ) || empty( $client_secret ) ) {
-			return rest_ensure_response(
-				array(
-					'success' => false,
-					'message' => 'No client ID or secret provided.',
-				)
-			);
+			return $this->return_error( 'No client ID or secret provided.' );
 		}
 
 		try {
 			$payee = $this->request_payee( $client_id, $client_secret, $use_sandbox );
 		} catch ( Exception $exception ) {
-			return rest_ensure_response(
-				array(
-					'success' => false,
-					'message' => $exception->getMessage(),
-				)
-			);
-
+			return $this->return_error( $exception->getMessage() );
 		}
 
-		$result = array(
-			'merchantId' => $payee->merchant_id,
-			'email'      => $payee->email_address,
-			'success'    => true,
+		return $this->return_success(
+			array(
+				'merchantId' => $payee->merchant_id,
+				'email'      => $payee->email_address,
+				'success'    => true,
+			)
 		);
-
-		return rest_ensure_response( $result );
 	}
 
 	/**
diff --git a/modules/ppcp-settings/src/Endpoint/LoginLinkRestEndpoint.php b/modules/ppcp-settings/src/Endpoint/LoginLinkRestEndpoint.php
index cb969c7ca..85ced8276 100644
--- a/modules/ppcp-settings/src/Endpoint/LoginLinkRestEndpoint.php
+++ b/modules/ppcp-settings/src/Endpoint/LoginLinkRestEndpoint.php
@@ -93,12 +93,9 @@ class LoginLinkRestEndpoint extends RestEndpoint {
 		try {
 			$url = $url_generator->generate( $products );
 
-			return rest_ensure_response( $url );
+			return $this->return_success( $url );
 		} catch ( \Exception $e ) {
-			return new WP_REST_Response(
-				array( 'error' => $e->getMessage() ),
-				500
-			);
+			return $this->return_error( $e->getMessage() );
 		}
 	}
 }
diff --git a/modules/ppcp-settings/src/Endpoint/OnboardingRestEndpoint.php b/modules/ppcp-settings/src/Endpoint/OnboardingRestEndpoint.php
index 03690d3bf..0a102c178 100644
--- a/modules/ppcp-settings/src/Endpoint/OnboardingRestEndpoint.php
+++ b/modules/ppcp-settings/src/Endpoint/OnboardingRestEndpoint.php
@@ -131,9 +131,9 @@ class OnboardingRestEndpoint extends RestEndpoint {
 			$this->flag_map
 		);
 
-		return rest_ensure_response(
+		return $this->return_success(
+			$js_data,
 			array(
-				'data'  => $js_data,
 				'flags' => $js_flags,
 			)
 		);
diff --git a/modules/ppcp-settings/src/Endpoint/RestEndpoint.php b/modules/ppcp-settings/src/Endpoint/RestEndpoint.php
index 35b2912fe..76626ac0c 100644
--- a/modules/ppcp-settings/src/Endpoint/RestEndpoint.php
+++ b/modules/ppcp-settings/src/Endpoint/RestEndpoint.php
@@ -10,6 +10,7 @@ declare( strict_types = 1 );
 namespace WooCommerce\PayPalCommerce\Settings\Endpoint;
 
 use WC_REST_Controller;
+use WP_REST_Response;
 
 /**
  * Base class for REST controllers in the settings module.
@@ -31,6 +32,54 @@ abstract class RestEndpoint extends WC_REST_Controller {
 		return current_user_can( 'manage_woocommerce' );
 	}
 
+	/**
+	 * Returns a successful REST API response.
+	 *
+	 * @param mixed $data  The main response data.
+	 * @param array $extra Optional, additional response data.
+	 *
+	 * @return WP_REST_Response The successful response.
+	 */
+	protected function return_success( $data, array $extra = array() ) : WP_REST_Response {
+		$response = array(
+			'success' => true,
+			'data'    => $data,
+		);
+
+		if ( $extra ) {
+			foreach ( $extra as $key => $value ) {
+				if ( isset( $response[ $key ] ) ) {
+					continue;
+				}
+
+				$response[ $key ] = $value;
+			}
+		}
+
+		return rest_ensure_response( $response );
+	}
+
+	/**
+	 * Returns an error REST API response.
+	 *
+	 * @param string $reason  The reason for the error.
+	 * @param mixed  $details Optional details about the error.
+	 *
+	 * @return WP_REST_Response The error response.
+	 */
+	protected function return_error( string $reason, $details = null ) : WP_REST_Response {
+		$response = array(
+			'success' => false,
+			'message' => $reason,
+		);
+
+		if ( ! is_null( $details ) ) {
+			$response['details'] = $details;
+		}
+
+		return rest_ensure_response( $response );
+	}
+
 	/**
 	 * Sanitizes parameters based on a field mapping.
 	 *