The issue number of a credit card is an additional set of numbers found at the end of the account number, and it is used to permit adjustments if the card is lost or stolen. The issue digits are included inside the complete account number.
After a four-digit number, the card issue number is situated on the signature strip on the back of the majority of cards, including Visa, MasterCard, and American Express. The four-digit number represents the card’s last four digits. During online or telephone purchases, cardholders are typically prompted to submit the 3-digit issue number for verification purposes. American Express issues card numbers with four digits.