Refund Webhook

Overview

Refund Webhook is an asynchronous notification that reports creation or a later status change of a refund operation. It reports an event but should not be treated as proof that funds reached the recipient unless the documented terminal state has that meaning.

The principal risks include duplicate customer notifications, repeated ledger postings, refund fulfillment before finality, forged callbacks, wrong-payment attribution, and missed failure or reversal states. For Refund Webhook, the event identifier, signature result, delivery attempt, and resulting business state should remain connected throughout processing.

A production implementation should verify the sender and payload, deduplicate by refund or event ID, preserve original payment linkage, process status transitions in order-aware logic, and reconcile against the refund system of record. A Refund Webhook handler should acknowledge only after durable receipt when the provider’s retry contract depends on the response.

Useful measures include refund-event latency, duplicate rate, signature failures, refunds without matching payments, unresolved statuses, and webhook-to-ledger reconciliation breaks. Refund Webhook is closely connected to Webhook Subscription, Payload Signature, and Refund Status. A receiver should treat transport acknowledgement and successful downstream processing as separate states for Refund Webhook.

Monitoring for Refund Webhook should track delivery age, signature failures, duplicate rate, retry exhaustion, and unresolved business events. Replay of Refund Webhook should preserve original identifiers and timestamps so historical processing cannot masquerade as a new event.

The Refund Webhook path should preserve ordering and duplicate evidence so delayed delivery cannot silently overwrite a newer state. Recovery for Refund Webhook should combine replay controls with an authoritative status check rather than trusting delivery history alone.