docs: function(params, callback) {
          /**
           * Callback for QB.pushnotifications.events.list(params, callback)
           * @callback listPushEventsCallback
           * @param {object} error - The error object
           * @param {object} response - An array of events' objects
           */
          if (typeof params === 'function' && typeof callback ==='undefined') {
              callback = params;
              params = null;
          }
  
          this.service.ajax({url: Utils.getUrl(config.urls.events), data: params}, callback);
      }