It’s worth noting that EU puts clear limits on the size of credit/debit card fees. You can’t add card fees on top of the price either, with some small exceptions.

> Traders in the EU are not allowed to charge you extra for using your credit or debit card. The only exceptions to this rule are American Express/Diners Club cards and business or corporate credit cards, where your employer is billed instead of you. If you use these cards, you may still be charged a fee but the fee can't be more than what it actually costs the trader to process your payment.

https://europa.eu/youreurope/citizens/consumers/shopping/pri...