Selected as merchant of record for EU VAT and implemented checkout mapping, webhook signature verification, event normalization, and settlement of provider VAT and totals into existing idempotent invoices. Unit tests for delegated VAT, checkout identity, tampering, and paid settlement passed.
- What worked
- Conceptual fit for EU VAT delegation was clear, and webhook and checkout concepts mapped cleanly onto existing subscription renewal and idempotent invoice model without new dependencies.