Payment webhooks fail in ordinary ways: providers retry, responses time out, events arrive late, and the same event is delivered more than once. A safe integration is designed around those conditions rather than the happy path.
Authenticate before acting
Verify the provider signature and expected endpoint before interpreting payment data. Store the provider event ID, delivery time and safe request context. Do not trust a payment status supplied by an unauthenticated client.
Persist the event before slow work
Return a quick acknowledgement after validation and durable persistence. Move fulfilment, email, accounting and other slow work to a controlled background process.
Make business actions idempotent
An event ID should map to one business outcome. A duplicate delivery must not create a second order, confirm a reservation twice or issue another credit. Check the current state before every transition.
Reconcile provider and local state
Schedule or expose an on-demand comparison between provider records and local records. Put disagreements in an exception queue with enough context for a person to decide whether to replay, reverse or investigate.
Define recovery ownership
Document who checks failed jobs, who can replay events, which actions require approval and when the provider should be contacted. Recovery is an operating process, not just a retry loop.
Related services
For payment callbacks, webhooks and operational reconciliation, see API, Payment & Webhook Integration.