When a buyer wins an auction or purchases an item, they are obligated to complete the transaction by sending full payment to the seller. However, lack of buyer experience and difficulties with electronic payment can sometimes result in unpaid items. In the event that you have a buyer who doesn't pay, you should try contacting the buyer directly to resolve the problem. If you're unable to contact your buyer and resolve the issue, you should open an unpaid item case. Once an unpaid item case is opened, the buyer has 4 days to make payment.