JMP does not provide a redirect URL for free. However, you can easily set up a redirect URL using Postman.
1. Go to https://www.getpostman.com.
2. Click the orange sign-in button in the top right corner.
3. Sign in with your Google account, or proceed to create your own account.
4. You can then use https://app.getpostman.com/oauth2/callback as a redirect URL.