Webhook Security Beyond the Signature Check

A webhook endpoint is a public, unauthenticated, attacker-reachable HTTP route that triggers privileged business logic — it creates orders, grants entitlements, downgrades accounts, moves money. Anyone on the internet can POST to it. The only thing standing between a stranger's request and your createOrder() call is whatever you put there. So webhook security is not a checkbox you tick once you've copied the signature-verification snippet from the docs. The signature check is the front door. Thi