shop/doc/core-apps/checkout/features.md

• checkout
  • validate cart, take address + payment selection, produce order via payment provider
  • routes: POST /checkout/preview, POST /checkout/confirm
  • events emit: checkout.confirmed
  • depends on: core, auth, catalog, cart, payment
  • room for growth: coupon slot, shipping-method slot, tax plug-in point, address book, guest checkout, order-draft persistence