eBay sellers of books etc may be encountering problems that appear to have been ongoing for several weeks now. Customers may be contacting you telling you they can’t pay, with far more silently abandoning their cart. Specifically, the problem is that eBay Checkout never passes the customer over to PayPal, as the log-on popup hangs forever at the ‘spinning disc’. If that’s the case, then tell them to add the following URLs to their ad-blocker whitelist…

That solved the problem for me. It appears that recent updates to Web browers adblockers, the popular UBlock Origin specifically, means that these URLs have to be whitelisted afresh. pay.ebay also looks new to me, and may be the real stumbling block. Your customer’s native Web browser ‘tracking protection’ / adblocker / pop-up blocking may need to be turned off, as well as secondary adblocking add-ons such as Fair AdBlocker. The generic ‘accept cookies’ pop-up may also need to be accepted, over at PayPal.