docs/install/guides/setup-app-webhooks.mdx
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.
Configure Webhook Secret
AP_APP_WEBHOOK_SECRETS={"@activepieces/piece-slack": {"webhookSecret": "SIGNING_SECRET"}}
Configure Webhook URL
https://YOUR_AP_INSTANCE/api/v1/app-events/slack.message.channelsreaction_addedmessage.immessage.groupsmessage.mpimapp_mention