Reconcile unknown creation outcomes by operation identity
The provider accepted creation but the application lost the response.
- Focused work estimate
- 3h 30m + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Reconciliation
Estimated field mix
- Integrations50%
- Distributed systems50%
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 software vendor changes payment providers. Its application must tolerate unknown outcomes, signed callbacks, refunds, and inconsistent settlement reports.
Setup prerequisites
- Create a local payment-provider double and synthetic orders; use test-only signatures and execute no financial transactions.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Query the provider using the original operation identity.
- Adopt the matching remote payment once.
- Keep missing or mismatched results unresolved.
Implementation constraints
- Bound query retries and elapsed reconciliation time.
Verification to include
- Recover a matching accepted payment.
- Reject a remote result with different amount or currency.
Deliverables
- Unknown-outcome reconciler.
Rollout and recovery
Stop new attempts for unresolved operations; retry reconciliation explicitly.
Value of the work
For the engineer: Practice idempotent integrations, state reconciliation, and provider migration.
For the team: Provide a reviewable adapter design that protects order consistency and recovery.
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.