What happens after you tap reserve.
The interesting part of a marketplace is the ninety seconds the customer never sees.
A reservation is a claim on a specific item with a specific window, so the first thing it does is decrement quantity everywhere — immediately, before payment confirms, because two people buying the last tray is the worst outcome available.
The merchant sees it on the pass with the window attached, not just an item name. For surplus that context matters: the same listing means something different at nine than at ten.
Then the countdown becomes shared. The customer sees time to collect; the kitchen sees time to hold. Both numbers come from the same source, which is why they never disagree.
Most marketplace failures are not payment failures. They are two people believing different things about the same tray.
