API, webhooks and backend

Statuses, idempotency, retries, audit logs and technical contracts. A VPOS.am article cluster for businesses, developers and integration teams.

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A backend-first approach to payment callbacks/webhooks and reliable order status transitions.

Useful payment logs let support reconstruct an order history without storing sensitive card data.

Idempotency prevents retries from creating duplicate payment operations, orders or fiscal actions.

A refund is a controlled financial event, not a note manually added to an order.

A custom website gives full checkout control, but it needs a strict backend contract, statuses and repeatable event processing.

How to design a payment backend that survives repeated events, network failures and manual operations without delivering an order twice.