Accounting Sync Service

Event-driven service that listens for expense approval events and orchestrates delivery to the configured accounting system. Implements at-least-once delivery with idempotency keys, exponential backoff retry for transient failures, and writes every sync attempt and outcome to audit_logs.

Feature: Accounting API

accounting-sync-service

• Subscribe to expense approval events and trigger accounting sync per organization config
• Generate and attach idempotency keys to prevent duplicate postings
• Execute retry logic with exponential backoff for transient API failures
• Write sync attempt, outcome, and provider reference to audit_logs
• Emit sync failure alerts when retry budget is exhausted