public function logout($cltrid = false)
 {
     $json = ApiRequest::DELETE('/auth', $cltrid ?: ApiRequest::defaultClientTransactionID(), $this->getAuthToken());
     $this->_sessionData['login'] = null;
     $this->_sessionData['token'] = null;
     $this->_sessionData['created'] = 0;
     $this->_sessionData['expires'] = 0;
     return $json;
 }