Only allow order from certain countries

Hi, How do you make sure that the cart only allows payments from certain contries only. Is there a configuration such as white list? Thanks.

How do you make sure that the cart only allows payments from certain contries only.
How about allow orders???
This is done by setting up a zone with your allowed countries

If you don't want to accept payments or ship to a given country, you can delete the country from your country list via your admin's Locations/Taxes->Countries.

Or, what might be a better method for future expansion of your sales might be to create Zone Definitions that are used to either limit the Billing Address or the Shipping Address and add these Zones to the Payment and Shipping modules that you are using ...

Then, later, if you decide to add additional countries, you can without having to try to rebuild your database tables ...