MasterCard Worldwide (NYSE: MA) is a multinational corporation based in Purchase, New York, USA.
Visa, Inc., commonly called VISA, is an economic joint venture of 21,000 financial institutions that issue and market Visa products including credit and debit cards.
American Express, sometimes known as "AmEx" or "Amex", is a diversified global financial services company, headquartered in New York City. The company is best known for its credit card, charge card and traveler's cheque businesses.
Diners Club International, originally founded as Diners Club, is a charge card company formed in 1950 by Frank X. McNamara, Ralph Schneider and Casey R. Taylor. When it first emerged, it became the first independent credit card company in the world.
Japan Credit Bureau, usually abbreviated as JCB, is a credit card company based in Tokyo, Japan. Its English name is JCB Co., Ltd.