Cancel a hotel booking

Only this account’s own bookings (404 otherwise). A refundable rate cancelled before its free_cancellation_until comes back in full: the captured payment is refunded, or a hold not yet captured is released. A cancellation that would cost money (a non-refundable rate, or past the free window) is refused with 409; the supplier ladder is in the booking terms. Can take over a minute — if the request times out, do NOT assume it failed; re-check before retrying.