Itch, as such, only accepts US dollars. It's a US-based store, and you must use a card that allows purchases in the US.

An alternative is to use PayPal, which usually accepts local cards with local currency and then converts them to dollars.

Sometimes, a developer might sell their game on Itch but not use Itch for payment processing. In those cases, they can change the currency, but this only applies to those specific projects.