/**
  * Sends a request type json 
  * 
  * @param Object $request this object is encode to json is used to request data
  * @param PayUHttpRequestInfo $payUHttpRequestInfo object with info to send an api request
  * @param bool $removeNullValues if remove null values in request and response object 
  * @return string response
  * @throws RuntimeException
  */
 public static function sendRequest($request, PayUHttpRequestInfo $payUHttpRequestInfo, $removeNullValues = NULL)
 {
     if (!isset($removeNullValues)) {
         $removeNullValues = PayUConfig::REMOVE_NULL_OVER_REQUEST;
     }
     if ($removeNullValues && $request != null) {
         $request = PayURequestObjectUtil::removeNullValues($request);
     }
     if ($request != NULL) {
         $request = PayURequestObjectUtil::encodeStringUtf8($request);
     }
     if (isset($request->transaction->order->signature)) {
         $request->transaction->order->signature = SignatureUtil::buildSignature($request->transaction->order, PayU::$merchantId, PayU::$apiKey, SignatureUtil::MD5_ALGORITHM);
     }
     $requestJson = json_encode($request);
     $responseJson = HttpClientUtil::sendRequest($requestJson, $payUHttpRequestInfo);
     if ($responseJson == 200 || $responseJson == 204) {
         return true;
     } else {
         $response = json_decode($responseJson);
         if (!isset($response)) {
             throw new PayUException(PayUErrorCodes::JSON_DESERIALIZATION_ERROR, sprintf(' Error decoding json. Please verify the json structure received. the json isn\'t added in this message ' . ' for security reasons please verify the variable $responseJson on class PayUApiServiceUtil'));
         }
         if ($removeNullValues) {
             $response = PayURequestObjectUtil::removeNullValues($response);
         }
         $response = PayURequestObjectUtil::formatDates($response);
         if ($payUHttpRequestInfo->environment === Environment::PAYMENTS_API || $payUHttpRequestInfo->environment === Environment::REPORTS_API) {
             if (PayUResponseCode::SUCCESS == $response->code) {
                 return $response;
             } else {
                 throw new PayUException(PayUErrorCodes::API_ERROR, $response->error);
             }
         } else {
             if ($payUHttpRequestInfo->environment === Environment::SUBSCRIPTIONS_API) {
                 if (!isset($response->type) || $response->type != 'BAD_REQUEST' && $response->type != 'NOT_FOUND' && $response->type != 'MALFORMED_REQUEST') {
                     return $response;
                 } else {
                     throw new PayUException(PayUErrorCodes::API_ERROR, $response->description);
                 }
             }
         }
     }
 }
 /**
  * Adjust miliseconds from epoch to date format 
  * @param the object or array $data
  * @throws InvalidArgumentException
  * @return the object or array processed
  */
 public static function formatDates($data)
 {
     if (!isset($data)) {
         throw new InvalidArgumentException("the object to format dates is null ");
     }
     if (!is_object($data) && !is_array($data)) {
         throw new InvalidArgumentException("the parameter to format dates is not a object or array");
     }
     foreach ($data as $k => $v) {
         if (PayURequestObjectUtil::isKeyDateField($k)) {
             if (is_array($data)) {
                 $miliseconds = $data[$k];
                 $data[$k] = PayURequestObjectUtil::getDate($miliseconds);
             } else {
                 if (is_object($data)) {
                     $miliseconds = $data->{$k};
                     $data->{$k} = PayURequestObjectUtil::getDate($miliseconds);
                 }
             }
         } else {
             if (is_object($data) && (is_object($data->{$k}) || is_array($data->{$k}))) {
                 $data->{$k} = PayURequestObjectUtil::formatDates($data->{$k});
             } else {
                 if (is_array($data) && (is_object($data[$k]) || is_array($data[$k]))) {
                     $data[$k] = PayURequestObjectUtil::formatDates($data[$k]);
                 }
             }
         }
     }
     return $data;
 }