public function getMailingTemplates($isPrivate = true) {
        $data["Envelope"] = array(
            "Body" => array(
                "GetMailingTemplates" => array(
                    "VISIBILITY" => ($isPrivate ? '0' : '1'),
                ),
            ),
        );
        $response = $this->_request($data);
        $result = $response["Envelope"]["Body"]["RESULT"];
        if ($this->_isSuccess($result)) {
            if (isset($result['MAILING_TEMPLATE']))
                return $result['MAILING_TEMPLATE'];
            else {
                return array(); //?
            }
        } else {
            throw new \Exception("GetLists Error: ".$this->_getErrorFromResponse($response));
        }
    }