post
https://apis.kentro.live/store/v1/checkout.status
Where an attempt stands: by attemptId, or, when the answer to checkout.start was lost, by the idempotencyKey and quoteFingerprint you sent. Poll it after a hosted payment page redirects back, or while the state is pending_payment, bank_processing or unknown; a payment that failed moments ago is retried with backoff before it is reported declined. needs_attention means the order is paid but the store finishes it by hand.
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.
