feat(ADM-018): completed feature

work/artifacts/F-023/documenter.md

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+# Documenter — F-023 Payments: provider interface + Stripe + webhooks
+
+## Summary
+Payments module isolates Stripe logic in a single adapter. The webhook endpoint verifies signatures and idempotently records events; payments_transactions is the source of truth.
+
+## Public API notes
+
+| Route | Access | Result |
+|---|---|---|
+| POST /payments/webhook | signature-protected | Persists event, transitions order when applicable |
+| GET /payments/orders/:orderId/transactions | authenticated | Lists transactions for the order |
+
+## Errors
+- `INVALID_PAYMENT_SIGNATURE` — HTTP 400
+
+## Evidence
+- `work/artifacts/F-023/architect.md`
+- `work/artifacts/F-023/implementer.md`
+- `work/artifacts/F-023/reviewer.json`
+- `work/artifacts/F-023/security.json`
+- `work/artifacts/F-023/qa.json`