MasterCard Worldwide is an American multinational corporation with its headquarters in the MasterCard International Global Headquarters in Purchase, New York. Throughout the world, its principal business is to process payments between the banks of merchants and the card issuing banks or credit unions of the purchasers who use the "MasterCard" brand debit and credit cards to make purchases. MasterCard Worldwide has been a publicly traded company since 2006. It was absorbed by the United California Bank in year 1966. Prior to its initial public offering, MasterCard Worldwide was a cooperative owned by the 25,000+ financial institutions that issue its card. read more