public override async Task Initialize()
        {
            var oAuthToken = AuthorizationToken.Token;

            ActivityUI.ChannelList.ListItems = (await _slackIntegration.GetChannelList(oAuthToken, false))
                                               .OrderBy(x => x.Key)
                                               .Select(x => new ListItem {
                Key = $"#{x.Key}", Value = x.Value
            })
                                               .ToList();

            EventSubscriptions.Manufacturer = "Slack";
            EventSubscriptions.Add("Slack Outgoing Message");

            CrateSignaller.MarkAvailableAtRuntime <StandardPayloadDataCM>(ResultPayloadCrateLabel)
            .AddField("token")
            .AddField("team_id")
            .AddField("team_domain")
            .AddField("service_id")
            .AddField("timestamp")
            .AddField("channel_id")
            .AddField("channel_name")
            .AddField("user_id")
            .AddField("user_name")
            .AddField("text");
        }
        public override async Task Initialize()
        {
            var usersTask    = _slackIntegration.GetUserList(AuthorizationToken.Token);
            var channelsTask = _slackIntegration.GetChannelList(AuthorizationToken.Token);
            await Task.WhenAll(usersTask, channelsTask).ConfigureAwait(false);

            var channelsAndUsersList = new List <ListItem>(usersTask.Result.Count + channelsTask.Result.Count);

            channelsAndUsersList.AddRange(channelsTask.Result
                                          .OrderBy(x => x.Key)
                                          .Select(x => new ListItem {
                Key = $"#{x.Key}", Value = x.Value
            }));
            channelsAndUsersList.AddRange(usersTask.Result
                                          .OrderBy(x => x.Key)
                                          .Select(x => new ListItem {
                Key = $"@{x.Key}", Value = x.Value
            }));
            ActivityUI.ChannelSelector.ListItems = channelsAndUsersList;
        }