Ask any AI coding agent to write a Stripe webhook handler and it will produce something reasonable in thirty seconds. Ask it to verify that handler actually works and it hits a wall. The problem isn't intelligence. It's plumbing. To debug a webhook you need to receive a real event on a public URL, check its signature, look at what actually arrived, fix your code, and run the same event again. Every step traditionally involves a human: clicking around a provider dashboard, copying a signing se...