I cannot add another card on my apple wallet. I am from czech republic

In my experience, banks or credit issuers sometimes require an additional step to set up a credit card in Apple Wallet. This step may involve a call, text message, or online account login. Verify with your card issuer that they support Apple Pay and inform them that you want to add the card to Apple Wallet and activate it for payments.

There are several possible reasons you might be experiencing issues. So let’s start with a few basic steps. I’ve added links to support articles that may offer solutions to issues you might encounter. 

Are you in a country or region that supports Apple Pay?

Countries and regions that support Apple Pay - Apple Support

Does your financial institution support Apple Pay?

Apple Pay participating banks in Asia/Pacific, Africa, Europe Latin America, Middle East and United States - Apple Support

Confirm your region is set correctly.

Change the language and region on iPhone - Apple Support

Change your Apple ID country or region