You can only make international payments to vendors outside the U.S when using a bank account or Mastercard credit card (2.9% fee) as the payment method. The payment is sent to the vendor as a wire transfer. Making international payments is more complex than domestic, with third parties involved to regulate the procedure. Therefore, there are specific fees to consider.
Fee for international payments
Paying international vendors with Bill Pay has a $20 flat fee for each transaction. This fee is a fixed rate, no matter the payment amount. If you pay via credit card there's an additional fee of 2.9%.