Define a portable synthetic webhook fixture
A copied JSON payload loses its original whitespace and cannot reproduce a signature mismatch. Store exact request bytes with safe headers and an expected event identity.
- Focused work estimate
- 1h + prerequisites
- Priority in the scenario
- Medium
- Engineering practice
- Serialization · Byte integrity · Test fixtures
Estimated field mix
- Quality engineering60%
- Integrations20%
- Security20%
Field percentages are editorial estimates of the ticket's engineering focus. They total 100%; they are not measured time, proficiency scores, or ownership evidence.
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Project context
An integration team closes incidents with screenshots of provider dashboards, then struggles to reproduce the same delivery sequence. Build a synthetic event corpus and replay runner against an allowlisted local receiver.
Setup prerequisites
- Create a local receiver fixture with an inspectable event store.
- Use generated test signing keys and synthetic payloads only.
Preceding work
No earlier ticket is required. Complete the project setup above.
Acceptance criteria
- The fixture preserves body bytes, content type, event ID, and schema version.
- Loading rejects unknown fields that could supply credentials or arbitrary destination URLs.
- The fixture includes a content digest and validates it before replay.
Implementation constraints
- Generate synthetic examples; do not import production customer payloads.
Verification to include
- Round-trip a body with whitespace and non-ASCII text byte-for-byte.
- Change one payload byte and verify digest validation fails before a request is sent.
Deliverables
- Fixture schema and three synthetic event examples
Rollout and recovery
Version the fixture format; retain older samples read-only until a validated converter exists.
Value of the work
For the engineer: Practice protocol verification, controlled fault injection, and reproducible incident investigation.
For the team: Review concrete evidence that webhook consumers tolerate real delivery failure patterns.
Evidence boundaries
Outcome Evidence: Tests, patches, and runbooks are requested deliverables. They become Outcome Evidence only through a qualified Mission and immutable Evidence IDs.
Ownership Evidence: Independent adaptation must be observed under a declared verification policy and cite immutable Evidence IDs. Completing a planning ticket establishes no Ownership Evidence.