Address pool, close, and late pay
How exclusive address borrow, close-to-cool, and late-pay queues work for USDT checkouts.
USDT checkouts borrow a free pool address per pending order. Closing an unpaid order releases the reservation into a cooling window so a late payment cannot confirm a newer order on a recycled address. Late pays are queued—never silently dropped.
Product tip: reuse or supersede pending USDT checkouts in your app so one end-user does not occupy many addresses at once.