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Certain apps like Slack and Square only support one webhook per OAuth2 app. This means that manual configuration is required in their developer portal, and it cannot be automated.

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Slack

Configure Webhook Secret
  1. Visit the “Basic Information” section of your Slack OAuth settings.
  2. Copy the “Signing Secret” and save it.
  3. Set the following environment variable in your activepieces environment:
  4. Restart your application instance.
Configure Webhook URL
  1. Go to the “Event Subscription” settings in the Slack OAuth2 developer platform.
  2. The URL format should be: https://YOUR_AP_INSTANCE/api/v1/app-events/slack.
  3. When connecting to Slack, use your OAuth2 credentials or update the OAuth2 app details from the admin console (in platform plans).
  4. Add the following events to the app:
    • message.channels
    • reaction_added
    • message.im
    • message.groups
    • message.mpim
    • app_mention
    • channel_created
    • reaction_removed
    • star_added
    • team_join
    • emoji_changed
Turn Socket Mode off for your Slack app (under Settings → Socket Mode). While Socket Mode is on, Slack delivers events over a WebSocket connection and never POSTs to the Request URL (https://YOUR_AP_INSTANCE/api/v1/app-events/slack), so the trigger silently never fires.
Configure Interactivity & Shortcuts Needed for the “New Modal Interaction” trigger and the “Request Approval”/“Request Action” actions (their buttons resume the flow via this URL).
  1. Go to the “Interactivity & Shortcuts” settings in the Slack OAuth2 developer platform.
  2. Turn interactivity on.
  3. Set the Request URL to the same URL used above: https://YOUR_AP_INSTANCE/api/v1/app-events/slack.