/**
  * @return AccountancyMonth
  * @throws IfirmaException
  */
 protected function _getCurrentAccountancyMonth()
 {
     $this->_initCurrentCurl(self::API_ACCOUNTANCY_MONTH_URL);
     $key = Utils::hexToStr($this->_getConfig()->{Config::API_KEY_SUBSCRIBER});
     $messageHash = Utils::hmac($key, sprintf("%s%s%s", self::API_ACCOUNTANCY_MONTH_URL, $this->_getConfig()->{Config::API_LOGIN}, Config::API_KEY_SUBSCRIBBER_NAME));
     $this->_setCurlGetOptions(self::API_ACCOUNTANCY_MONTH_URL, $this->_getRequestHeaders($messageHash));
     $rsp = curl_exec($this->_currentCurl);
     return Response::constructAccountancyMonthFromResponse($rsp);
 }