If you accept PayPal payments, you can set up your Payment Receiving Preferences to block certain types of buyers. You can decide not to sell internationally or to block purchases from buyers who have not confirmed their address. This adds another layer of protection for you as the seller. Additionally, you can decide to accept payments only if they are made in a specific currency, and you can block buyers who try to purchase with a credit card when they have a bank account linked to their credit account.