Webhook Failure Reproduction Packet

A webhook failure reproduction packet is a compact record that separates delivery problems from verification problems and handler problems.

Webhook bugs are easy to misread because the same symptom can come from several layers. A missing event may mean the provider never sent it, the request was blocked by a gateway, the signature check rejected it, the handler threw after receiving it, or the retry system delivered it later than expected. Treating all of these as “webhook not working” wastes time.

Start with the provider side. Capture the event id, event type, provider timestamp, delivery attempt count, target URL, HTTP status recorded by the provider, and whether the provider says it will retry. If the provider exposes a raw request preview, keep the payload shape but remove customer identifiers, tokens, and secret material.

Then capture the receiver side. Record the route hit timestamp, request id or trace id, response status, signature verification result, handler duration, idempotency key, and whether the event id was already processed. If the receiver has no matching log line, the bug is probably routing, DNS, firewall, TLS, gateway, or method mismatch before application code.

A useful packet includes one expected behavior and one observed behavior. Example: “event invoice.paid should create subscription entitlement once; provider delivery attempt 3 received HTTP 400; receiver log shows signature timestamp outside tolerance; local clock drift was 8 minutes.” That sentence gives a developer a testable hypothesis.

Do not debug retries before idempotency is visible. A handler that succeeds once but fails on repeat delivery may look like a provider problem when the real issue is duplicate handling. Likewise, do not rotate secrets until the old and new secret windows are documented. Secret rotation can create false negatives that hide the original bug.

The minimum packet: provider event id, event type, delivery status, receiver trace id, verification outcome, handler outcome, sanitized payload shape, and a single replay instruction. Anything less may still be useful, but it is not enough to distinguish transport, authentication, and business logic failures.

Webhook Failure Reproduction Packet

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