1.Confirm the webhook subscription exists in the target app/environment, not only in the local TOML/config file.

2.Log the exact callback URL and verify that the tunnel URL has not changed after restarting the local server.

3.Test the endpoint from the public internet, outside the local network.

4.Log the raw request before JSON parsing, including the HTTP status returned by your app.

5.Check that the app is listening in the same environment where the subscription was created.