# F-186 — Documentation

- Added `docs/pos/POS_CHECKOUT.md` with admin setup, cashier state flow, stock/free line contracts, mixed payment/change invariants, ticket print/email, reporting capture and follow-up roadmap.
- Added a precedence notice in `docs/pos/POS_API.md` because its discovery-era single-payment request is superseded by the implemented F-186 contract.
- Documented that custom method labels do not imply real provider integrations.
- Documented that paid sales are `COMPLETED`; pending balances and returns remain F-188/F-189.
