Everywhere that a Mastercard debit/credit card payment will be accepted. This includes online purchases, POS transactions, and contactless ATM withdrawals.
📄 Note
Exceptions to this are Belarus, Crimea, Cuba, Democratic People's Republic of Korea (DPRK), Iran, Libya, Myanmar, Russian Federation, Syria, Luhansk, Donetsk, Russian-controlled parts of Zaporizhzhia and Kherson, Venezuela, and Zimbabwe.