Created memory entry documenting correct way to verify ticket-invoice linkage
in Syncro API after 2026-04-30 incident where faulty verification script
falsely claimed 31 tickets had no invoices (actually 29 had invoices properly,
2 were correctly Non-Billable).
Key lessons:
- List endpoint does NOT return ticket_id or line_items
- Must query individual invoices for full data
- Invoice numbers are strings, not integers
- Use ticket ID (internal), not ticket number (user-visible)
Added to memory index for future GrepAI semantic search.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
