code: protected function get($path, array $parameters = array(), $requestHeaders = array())
      {
          if (array_key_exists('ref', $parameters) && is_null($parameters['ref'])) {
              unset($parameters['ref']);
          }
          $response = $this->client->getHttpClient()->get($path, $parameters, $requestHeaders);
  
          return ResponseMediator::getContent($response);
      }
docs: Send a GET request with query parameters.
  
  @param string $path           Request path.
  @param array  $parameters     GET parameters.
  @param array  $requestHeaders Request Headers.
  
  @return \Guzzle\Http\EntityBodyInterface|mixed|string