What info do online merchants get with credit card purchase?

I'm buying something online that I don't want associated with my name. The main threat vector is if the seller gets hacked. The merchant website/vendor is primitive and the merchant doesn't seem very technically advanced.

Usually, I use prepaid debit cards to make these types of purchases but the merchant is Euro-based, so USA prepaid debit cards don't work.

I have a Citi credit card which allows me to spin up virtual CCs. Citi can get hacked but it's low …

card credit credit card privacy