The nickname for the last four digits of your credit card number is often referred to as the "security code" or "CVV."
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American Express is the credit card that has exactly 15 digits in its card number.
An American Express credit card number has 15 digits.
The maximum number of digits in an American Express credit card number is 15.
An American Express (AMEX) credit card number has 15 digits.
The first 4 digits of an American Express credit card number typically start with 3, 4, or 37.