Backend

Articles on building reliable APIs, integrations, data pipelines and automation, and keeping them running in production.

RSS feed for Backend

16 October 2026Backend

Idempotent payment webhooks: handling duplicates, retries and out-of-order events

How to build a webhook handler that survives duplicate and out-of-order deliveries: signature checks, an event ID table, one transaction and an outbox.

Webhooks
Idempotency
Payments

Have something you'd like built?

Tell us what you're building. We'll reply within two working days with questions, an approach and next steps.

Start a project