Credit and Chargecard Account Numbering Formats

There are several different types of cards, but for our purposes they can be “batched into 2 categories. There are credit cards, like Visa and Mastercard, “and in this group we shall also include chargecards, like American Express, “Diners Club and Carte Blanche. The second category comprises entertainment “cards, also known as calling cards, which includes corporate cards.