Currently, the ability to accept credit card payments through your Universe site with the Sell Block is limited to the United States at this time.
This means you can only set up the Sell Block to accept US Dollars and U.S.-based shipping addresses. We plan to expand this service to other markets at a later time.
In the meantime, you may use a Text Block to direct customers to reach out to you directly to arrange payment in another way. Additionally, you can utilize a Pro feature like the Code Block to embed buttons from services like Paypal to allow your customers to pay you in your own currency. Both PayPal and Square have international merchant services that work well with the Code Block or Button Block.
We've made a test website here so you can see how it could look: https://icebox.onuniverse.com/shop/paypal
You can see the full list of customizable buttons from PayPal embed here.
Note: Using a third-party payment method will not allow you to use Sell Block features like products, payouts, or receipts.