Sync Check

2. Offline Queue (ADR-006)

• SyncQueueItem model exists with FIFO ordering
• Max retry count is 3
• Queue auto-processes on:
  • Network connectivity restored (NWPathMonitor)
  • App foregrounding (scene phase change)
• Failed items are re-enqueued, not dropped

3. Auth Chain

• QBAuthManager stores tokens in BusinessProfile (not Keychain)
• Token refresh has 5-minute buffer before expiry
• 401 response triggers token refresh then retry (once)
• Refresh token expiry (100 days) triggers re-auth flow
• ASWebAuthenticationSession for OAuth flow

4. API Client

• QBAPIClient is an actor (thread safety)
• Bearer token in Authorization header
• 429 rate limiting handled (backoff or queue)
• 5xx errors propagated, not silently swallowed

5. DTO Mapping

• QBModels use dynamic CodingKey for PascalCase Intuit responses
• Section → DescriptionOnly + SubTotalLineDetail mapping (QB has no native sections)
• Customer auto-pushed if not yet synced before estimate/invoice push

6. UI Integration

• SettingsView has connect/disconnect QB flow
• Detail views show sync indicator
• Dashboard shows: pending count badge, sync spinner, error dot

Output Format

## QB Sync Health Check

- [x] Push-on-action: markSent() triggers sync
- [x] Push-on-action: savePayment() triggers sync
- [ ] ISSUE: Queue retry count is 5, should be 3 (SyncCoordinator.swift:42)
- [x] Auth: 5-min refresh buffer
...

### Result: HEALTHY / X ISSUES FOUND