JMP does not provide a redirect URL for free. However, using Postman, it is easy to set one up yourself. Some examples that follow use Postman to redirect requests.
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.