Return 424 instead of 400 when checkout payment fails (#7273)

* Return 424 instead of 400 when checkout payment fails

* Change status for 424 to 402

src/StoreApi/Routes/V1/Checkout.php

@@ -518,7 +518,7 @@ private function process_payment( \WP_REST_Request $request, PaymentResult $paym
 				throw new RouteException( 'woocommerce_rest_checkout_invalid_payment_result', __( 'Invalid payment result received from payment method.', 'woo-gutenberg-products-block' ), 500 );
 			}
 		} catch ( \Exception $e ) {
-			throw new RouteException( 'woocommerce_rest_checkout_process_payment_error', $e->getMessage(), 400 );
+			throw new RouteException( 'woocommerce_rest_checkout_process_payment_error', $e->getMessage(), 402 );
 		}
 	}