Build reliable NestJS webhooks for SaaS payments and integrations using signature verification, idempotency, durable inboxes, queues, retries, and observability.
NestJS webhook gateway verifying signatures and processing idempotent events through a durable retry queue
Webhooks are untrusted, duplicated, and out of order by design. A payment provider can retry the same event, deliver it late, or time out while your NestJS API successfully processes it. Treating a webhook like an ordinary controller request is how SaaS products double-activate subscriptions and lose billing events.
A reliable webhook pipeline verifies the raw payload, records the event durably, responds quickly, and processes business logic asynchronously. Idempotency makes retries safe; queues and observability make failures recoverable.
Why webhook controllers fail in production
