/**
  * @param array       $vars
  * @param Client      $client
  * @param HttpRequest $httpRequest
  * @return mixed
  */
 public function relay($vars, Client $client, HttpRequest $httpRequest)
 {
     $url = $client->webHookEndPoint();
     $httpRequest->setAuth($client->name(), $client->apiKey());
     $httpRequest->post($url, $vars);
     return $httpRequest->statusCode() == 200 ? true : false;
 }