American Express

American Express, AmEx or Amex, is an international financial services company and is the largest global card issuer with regards to purchase volume. The company is a household name in all corners of the globe, and is well known for its credit card, charge card, and traveler’s services. American Express also provide commercial payment tools and facilities.

Out of the total volume of card card processing which occurs in the United States, 24% stems from American Express cards.