How to Build Idempotent Stripe Webhook Handlers in Go Using a Single DB Table

A technical guide published on DEV Community details how to build a production-safe Stripe webhook handler in Go that prevents duplicate event processing. The approach centers on a single PostgreSQL table called processed_events, which uses a primary key constraint and an INSERT ON CONFLICT DO NOTHING pattern to ensure each webhook is processed only once. The HTTP handler reads and size-limits the request body, verifies Stripe's signature, and immediately enqueues the event — returning a 200 response within milliseconds without executing any business logic inline. A background goroutine then processes pending events in a separate transaction, applying subscription updates, purchases, or refunds as needed. The design is intentionally portable, avoiding database-specific types, and uses Stripe's IgnoreAPIVersionMismatch option to decouple deployment from dashboard API version settings.