ACME-2019: Epic for Checkout Service reliability improvement 19

Date: 2026-01-06 Type: Epic Priority: P0 Service: Checkout Service Owner: Commerce Platform GitHub References: GH-2019, GH-2020 API References: API-CHECKOUT-01, API-CHECKOUT-02, API-CHECKOUT-03, API-CHECKOUT-04

Business Context

Acme Commerce depends on the Checkout Service to protect customer trust during high-volume shopping periods. This ticket captures engineering work needed after operational reviews found risk from schema drift between a downstream contract and the deployed parser.

Scope

• Review service contract behavior against API-CHECKOUT-04.
• Update dashboards and alerts owned by Commerce Platform.
• Coordinate rollout with the teams that operate Authentication Service, Checkout Service, Billing Service, Inventory Service, and Notification Service.
• Link implementation work to GitHub items GH-2019, GH-2020.

Definition of Done

• Tests cover nominal, timeout, replay, and malformed payload scenarios.
• Runbook steps are updated and validated in staging.
• Incident review owners can cite this ticket as remediation evidence.