post
https://apis.kentro.live/store/v1/checkout.confirm
Asks the payment provider what happened to the attempt (attemptId) and completes the order when the payment succeeded, for example when the buyer returns from the hosted payment page. Safe to repeat; it never charges again.
Who may call it: The identity that started the attempt: the signed-in buyer, or the guest (send the same X-Storefront-Guest and guestAttempt: true). A signed-in buyer recovering an attempt started as a guest sends both tokens.
