YouTube RSS to Slack DIgest

## Setting up Slack OAuth for Posting & Event Listening

1. **Create a Slack App**: `api.slack.com/apps` → **Create New App** → “From scratch.”  
2. **Add Bot Token Scopes**:  
   - `chat:write` (post messages)  
   - `channels:read` & `groups:read` (find channel IDs)  
3. **Enable Event Subscriptions**:  
   - Turn on **Event Subscriptions** → set your n8n public webhook URL.  
   - Subscribe to the **`app_mention`** event so the bot fires when mentioned.  
4. **Install the App**: Click **Install App**, authorize, and copy the **Bot User OAuth Token** (`xoxb-...`) into an n8n Slack credential.  
5. **Invite Bot to Channel**: `/invite @YourBot` in the target channel.  
6. **Test**: Send “`@YourBot add/remove {YouTube Channel link}`” and watch the workflow update the sheet.

*(If you change scopes later, reinstall the app so the token picks up new permissions.)*