Paranoia\Payment\Adapter\Gvp::parseResponse PHP Method

    protected function parseResponse($rawResponse, $transactionType)
    {
        $response = new PaymentResponse();
        try {
            /**
             * @var object $xml
             */
            $xml = new \SimpleXmlElement($rawResponse);
        } catch (\Exception $e) {
            $exception = new UnexpectedResponse('Provider returned unexpected response: ' . $rawResponse);
            $eventArg = new PaymentEventArg(null, null, $transactionType, $exception);
            $this->getDispatcher()->dispatch(self::EVENT_ON_EXCEPTION, $eventArg);
            throw $exception;
        }
        $response->setIsSuccess('00' == (string) $xml->Transaction->Response->Code);
        $response->setResponseCode((string) $xml->Transaction->ReasonCode);
        if (!$response->isSuccess()) {
            $errorMessages = array();
            if (property_exists($xml->Transaction->Response, 'ErrorMsg')) {
                $errorMessages[] = sprintf('Error Message: %s', (string) $xml->Transaction->Response->ErrorMsg);
            }
            if (property_exists($xml->Transaction->Response, 'SysErrMsg')) {
                $errorMessages[] = sprintf('System Error Message: %s', (string) $xml->Transaction->Response->SysErrMsg);
            }
            $errorMessage = implode(' ', $errorMessages);
            $response->setResponseMessage($errorMessage);
        } else {
            $response->setResponseMessage('Success');
            $response->setOrderId((string) $xml->Order->OrderID);
            $response->setTransactionId((string) $xml->Transaction->RetrefNum);
        }
        $event = $response->isSuccess() ? self::EVENT_ON_TRANSACTION_SUCCESSFUL : self::EVENT_ON_TRANSACTION_FAILED;
        $this->getDispatcher()->dispatch($event, new PaymentEventArg(null, $response, $transactionType));
        return $response;
    }