Stripe webhooks in Go: the complete idempotent handler, line by line

Every Stripe tutorial in Go shows the same forty lines: read the body, call ConstructEvent, switch on the type, update the database. Those forty lines double-charge on a retry, lose a payment on a restart, trust a payload an attacker can shape, and time out under a burst. This is the handler GoVueKit ships instead — the actual code, then each...