Verify credit card in all market places?

Hi,

Trying to sign up to sell on Amazon in the UK.

Currently on verifying my credit card.

Amazon has assigned me to various market places, UK, Germany, France etc etc. The card verification process allows me to choose which of those markets to verify for.

Do I need verify my credit card for all the markets I’ve been assigned or just the UK market?

Why would I be assigned to various countries that I didn’t request?

Thanks.