public string Authorize(string channelName, string socketId)
        {
            IAuthenticationData auth = null;

            if (_presenceData != null)
            {
                auth = _pusher.Authenticate(channelName, socketId, _presenceData);
            }
            else
            {
                auth = _pusher.Authenticate(channelName, socketId);
            }
            return(auth.ToJson());
        }
        public string Authorize(string channelName, string socketId)
        {
            var auth = _pusher.Authenticate(channelName, socketId, _presenceData);

            return(auth.ToJson());
        }