BBB Etymology - Credit Card
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The credit card was the successor of a variety of merchant credit schemes. It was first used in the 1920s, in the United States, specifically to sell fuel to a growing number of automobile owners. In 1938 several companies started to accept each others cards.
The concept of paying merchants using a card was invented in 1950 with Diners Club's invention of the charge card, which is similar but required the entire bill to be paid with each statement; it was followed shortly thereafter by American Express.