Explain settlement discrepancies without automatic repair
Finance staff see only a mismatch count and cannot identify its cause.
- Focused work estimate
- 2h 30m + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Diagnostics · Reconciliation
Estimated field mix
- Integrations60%
- Data engineering40%
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.
- BBILL-101 · Map provider payment states to explicit order transitions
- BBILL-102 · Bind payment creation retries to one local operation
- BBILL-103 · Verify callback signatures before trusting event fields
- BBILL-104 · Apply duplicate and out-of-order payment callbacks idempotently
- BBILL-105 · Reconcile unknown creation outcomes by operation identity
- BBILL-106 · Represent partial refunds without rewriting original payment facts
- BBILL-107 · Import settlement rows with source-file provenance
Acceptance criteria
- Classify missing, amount, currency, and timing mismatches.
- Link each discrepancy to local and provider identities.
- Keep disputed records unchanged.
Implementation constraints
- Do not infer fraud or automatically move funds.
Verification to include
- Explain a timing difference and an amount mismatch.
- Verify unknown discrepancies remain unresolved.
Deliverables
- Discrepancy report.
Rollout and recovery
Use reports for reviewed repair; keep reconciliation read-only by default.
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.