Real-time Two-Way Sync between Notion and Todoist

# 2. Setup Todoist Webhook
- In the Todoist App open Settings > Integrations > Developer > Build Integrations
- Click "Create a new app"
  - App name: "Notion-Todoist Sync" / Name of your n8n instance
  - App service URL: (leave empty)
- Click "Create app"
- Update settings of the app:
  - OAuth redirect URL: Grab the production URL of the "OAuth redirect" Node (from step 3 on the right)
- Click on "Save settings", leave tab open

- Activate this workflow
- Open the Production URL of the "Todoist Webhook Setup Helper" Node (from step 3 on the right)
- Copy the Client ID and secret from the App settings into the form and submit it
- When prompted for permissions, click on "Agree"

- Go back to App settings tab
- Scroll further down to "Webhook"
- Update settings of the app:
  - Webhook callback URL: Grab the production URL of the "Todoist Webhook" Node (Todoist to Notion Diff sync)
  - Select these options:
    - item:added
    - item:updated
    - item:completed
    - item:uncompleted
    - item:deleted
- Click "Save webhook configuration"
- Click "Activate webhook"
- Settings can now be closed