Retrieve a Basket

Returns the full state of a Basket — its items, guests, payments, applied coupons and vouchers, totals, and submit state. This is the canonical endpoint frontends call after any mutating action to reconcile their local view of the cart.

Baskets that were submitted more than an hour ago and aren't attached to a visit return 404 so that completed checkouts can't be re-rendered by stale links.