// logging data and throw exception throw new InvalidArgumentException('Order validation Error!'); } switch ($method) { // Just check order (check server status, check order in DB and etc) case 'check': print $unitPay->getSuccessHandlerResponse('Check Success. Ready to pay.'); break; // Method Pay means that the money received // Method Pay means that the money received case 'pay': // Please complete order print $unitPay->getSuccessHandlerResponse('Pay Success'); break; // Method Error means that an error has occurred. // Method Error means that an error has occurred. case 'error': // Please log error text. print $unitPay->getSuccessHandlerResponse('Error logged'); break; // Method Refund means that the money returned to the client // Method Refund means that the money returned to the client case 'refund': // Please cancel the order print $unitPay->getSuccessHandlerResponse('Order canceled'); break; } // Oops! Something went wrong. } catch (Exception $e) { print $unitPay->getErrorHandlerResponse($e->getMessage()); }