SwipeSimple is designed to be used by merchants who are accepting transactions in the United States of America.
International issued cards can be accepted and processed as long as they are issued by a supported payment network such as Visa, Mastercard, American Express, and Discover.
International Addresses and Address Verification:
When processing a keyed transaction on the web using an Invoice or Payment Link with address verification using an international address, complete the Address, City and Zip code fields only. The State or Territory drop down menu only contains US states and territories. Leaving this selection empty will not prevent the transaction from processing.