Your buyers might be having problems buying from you this morning. There’s a problem with eBay checkout which is currently being worked on.
eBay say they are “currently experiencing checkout problems. Community members may see errors or timeouts when attempting to pay for an item. We are working on the problem and apologise for the inconvenience.”
Hopefully this will be fixed soon, but if you’re not seeing many sales this morning or payments aren’t coming through at least you’ll know why.
Edited to add: This issue should now be fixed