Payment Webhooks Will Lie To You. Here's How We Built Ones That Don't (in NestJS)

A payment webhook fires once. You miss it. The customer thinks they paid. Your dashboard says they didn't. Welcome to my Tuesday morning, two years ago. I've shipped four payment webhook systems in my career. The first three taught me everything I now refuse to do again. The fourth — the one running inside Atoa today — handles open banking payment notifications across our Node.js services without a single missed event in the last 14 months. Here's the boring, opinionated, production-tested patte