And if you have already selected the "Unpaid Item Assistant" feature, eBay will automatically contact the buyer with a reminder to pay or start the process to cancel the transaction.

https://www.ebay.com/help/selling/getting-paid/resolving-unpaid-items?id=4137#:~:text=If%20the%20buyer%20doesn't,select%20Report%20an%20unpaid%20item.

I've been on eBay for 22 years and can count on one hand the buyers who did not pay for their items. One memorable instance, a lady contacted me to say her 8-year-old brat (errr, son) was bidding for everything without her knowledge and, of course, without money. That's why, in real auctions, 8-year-olds who keep raising their paddles to buy are promptly escorted to the door.