docs: function(params, callback) {
          /**
           * Callback for QB.chat.message.list()
           * @param {Object} error - The error object
           * @param {Object} messages - The messages object.
           * @callback listMessageCallback
           * */
  
          this.service.ajax({
              url: Utils.getUrl(MESSAGES_API_URL),
              data: params
          }, callback);
      }