Invoice Webhook

Overview

Invoice Webhook is an asynchronous HTTP notification sent when an invoice-related payment record is created or changes status. It is an event delivery mechanism, not the invoice itself and not an authoritative replacement for querying payment state when delivery is uncertain.

The principal risks include duplicate delivery, delayed delivery, forged callbacks, out-of-order status changes, endpoint downtime, and fulfillment triggered before the required confirmation state. A receiver should treat transport acknowledgement and successful downstream processing as separate states for Invoice Webhook.

A production implementation should verify the payload signature, acknowledge quickly, deduplicate by event or payment identifier, persist the raw event, and process business actions asynchronously. Monitoring for Invoice Webhook should track delivery age, signature failures, duplicate rate, retry exhaustion, and unresolved business events.

Useful measures include delivery latency, acknowledgement rate, signature failures, duplicate rate, retry count, and unresolved invoice events. Invoice Webhook is closely connected to Webhook Subscription, Payload Signature, and At-Least-Once Delivery. Replay of Invoice Webhook should preserve original identifiers and timestamps so historical processing cannot masquerade as a new event. For Invoice Webhook, the event identifier, signature result, delivery attempt, and resulting business state should remain connected throughout processing.

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

A Invoice Webhook handler should acknowledge only after durable receipt when the provider’s retry contract depends on the response. Business actions triggered by Invoice Webhook should be idempotent and should verify the current object state before fulfillment or accounting updates.