Define immutable webhook envelopes independently of database rows
Event payloads mirror internal shipment rows and change whenever the schema changes.
- Focused work estimate
- 1h + prerequisites
- Priority in the scenario
- Medium
- Engineering practice
- Event API design
Estimated field mix
- API design80%
- Data engineering20%
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
A fictional logistics platform sends shipment events to partner endpoints. Partners need stable schemas and recovery semantics despite duplicate delivery, failures, and subscription changes.
Setup prerequisites
- Create a local webhook sender and receiver doubles with synthetic shipment events and disposable signing keys.
Preceding work
No earlier ticket is required. Complete the project setup above.
Acceptance criteria
- Publish event ID, type, version, and occurrence time.
- Use a deliberate public payload projection.
- Preserve emitted event bytes or canonical content identity.
Implementation constraints
- Exclude internal fields and hidden operational metadata.
Verification to include
- Create a documented shipment event.
- Change an internal-only field without altering the public contract.
Deliverables
- Webhook envelope schema.
Rollout and recovery
Version public payloads before accepting subscriptions.
Value of the work
For the engineer: Practice public event contracts, delivery guarantees, and partner recovery workflows.
For the team: Provide inspectable asynchronous integration behavior with controlled retries and clear compatibility.
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.