# Source: https://www.activepieces.com/docs/install/guides/setup-app-webhooks.md

> ## Documentation Index
> Fetch the complete documentation index at: https://www.activepieces.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# How to Setup App Webhooks

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.

## 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:
   ```
   AP_APP_WEBHOOK_SECRETS={"@activepieces/piece-slack": {"webhookSecret": "SIGNING_SECRET"}}
   ```
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`