Disclosure: I'm a senior backend tech lead and I run HostingGuru. This article mentions HostingGuru once near the end. The four patterns below work on any platform, any framework, with any webhook provider (Stripe, GitHub, Twilio, Postmark). I want it useful even if you never become a customer. Two weekends ago a founder I do code reviews for sent me a panicked DM at 11pm: "A customer just opened a chargeback because we never unlocked their Pro plan. Stripe says the subscription is active. What's happening?" His webhook handler had crashed three days earlier at 3:14am on a Sunday. Stripe retried for 72 hours, gave up, marked the event as failed in their dashboard. Nobody was watching. The customer paid $49, got the same free-tier experience, asked for a refund, didn't get a fast reply, opened a dispute. By the time we caught it, his MRR was down one customer and his Stripe account had a $15 dispute fee on top. The fix took an hour. The damage took weeks to unwind.…