Expense Integration Reference

Summary

A concise ownership map linking to detailed Technical, API, Database, and Events documentation.

Developers, operators, QA, support, architects, and implementation teams.

Integration	Direction/mechanism	Expense responsibility	Maturity	Detail
Identity	Inbound request context	Authentication/tenant/actor context	Transitional	Authentication
Workflow	Outbound HTTP plus inbound callback	Start/link approval and apply decision	Transitional	Workflow events boundary
Payroll	Outbound events plus compatibility HTTP guard	Publish lifecycle; check frozen period	Transitional	Payroll events
Notification	Outbound lifecycle events	Publish; Notification owns intent/delivery	Transitional	Notification events
Document	Synchronous HTTP	Store/download content externally; keep reference	Transitional	Receipt API
Gateway	Reverse proxy/compatibility routing	Native and legacy-shaped exposure	Transitional	Compatibility routing
Messaging	Transactional outbox and broker publisher	Durable intent and relay	Confirmed with governance gaps	Outbox delivery

Reporting and Platform integration are not confirmed.

Integration SLOs, ownership boundaries, reconciliation, schema governance, and final cutover state require confirmation.

microservices/src/expense-service/Program.cs
microservices/src/expense-service/Infrastructure/WorkflowServiceClient.cs
microservices/src/expense-service/Infrastructure/DocumentReceiptGateway.cs
microservices/src/payroll-service/Messaging/PayrollReadModelConsumer.cs
microservices/src/notification-service/Application/EventNotificationResolver.cs
microservices/src/gateway-api/Program.cs