Webhook Handler

Overview

A Webhook Handler is the HTTP-facing function or service that accepts an incoming webhook request, verifies it, parses the payload, records the event, and returns the required acknowledgement. Recovery for Webhook Handler should combine replay controls with an authoritative status check rather than trusting delivery history alone.

The main risks include signature checks on reserialized bodies, blocking work, unhandled malformed payloads, duplicate effects, and leaking error details. It should remain narrow and resilient; lengthy business processing is usually better moved to an asynchronous consumer after durable acceptance.

In production, teams should define ownership and apply raw-body signature verification, method and content-type checks, schema validation, size limits, durable enqueue, idempotency, and fast acknowledgement. The Webhook Handler path should preserve ordering and duplicate evidence so delayed delivery cannot silently overwrite a newer state.

Useful measures include handler success rate, acknowledgement latency, validation failure rate, enqueue failure rate, and request size distribution. Webhook Handler is closely connected to Webhook Acknowledgement, Webhook Consumer, and Webhook Payload Validation. Business actions triggered by Webhook Handler should be idempotent and should verify the current object state before fulfillment or accounting updates.

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

For Webhook Handler, the event identifier, signature result, delivery attempt, and resulting business state should remain connected throughout processing. A receiver should treat transport acknowledgement and successful downstream processing as separate states for Webhook Handler.