have no idea. i was curious some years ago but at that time if i recall correctly, PayPal must be linked with bank account, which i declined to do and still as well.You should be able to checkout via PayPal as a Guest using your card without registering with PayPal afaik..?
second option was to link to credit card, which is ok. but there was quite a charges from PayPal for such service.
perhaps should find the time and check out their policies again. maybe it has some changes toward better deals. i just wondering what is an obstacle for those,
who sell over internet, to set up acceptance of different forms of payments?