Payu\Request\RequestAbstract::getRawData PHP Method

    public function getRawData()
    {
        return $this->rawData;
    }

 /**
  * @param RequestAbstract $request
  * @param string $endpointUrl
  * @return \Guzzle\Http\EntityBodyInterface|string
  * @throws Exception\ConnectionError
  */
 private function sendRequest(RequestAbstract $request, $endpointUrl)
 {
     $client = new HttpClient();
     $client->setConfig(array('curl.options' => array(CURLOPT_SSL_VERIFYPEER => false, CURLOPT_SSL_VERIFYHOST => false)));
     $httpRequest = $client->post($endpointUrl, null, $request->getRawData());
     try {
         return $httpRequest->send()->getBody();
     } catch (RequestException $e) {
         throw new ConnectionError($e->getMessage());
     }
 }