Payment Callback After Order Cancellation? 3 Consistency Challenges and Practical Engineering Solutions
The article examines why payment callbacks that arrive later than order cancellations cause money‑in‑order‑canceled anomalies, outlines the three core eventual‑consistency problems—message ordering, duplicate consumption, and message loss—and presents a complete engineering solution using business idempotency keys, a transactional outbox, state‑machine handling, and reconciliation compensation.
