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When an authorized user made a purchase, a clerk retrieved the plate from the store's files and then processed the purchase.

In contrast, credit cards allow the consumers a continuing balance of debt, subject to interest being charged.

Not all credit cards have the same sets of extra codes nor do they use the same number of digits.

The concept of using a card for purchases was described in 1887 by Edward Bellamy in his utopian novel Looking Backward.

or embossed bank card number complying with the ISO/IEC 7812 numbering standard.

The card number's prefix, called the Bank Identification Number, is the sequence of digits at the beginning of the number that determine the bank to which a credit card number belongs.

In recording a purchase, the plate was laid into a recess in the imprinter, with a paper "charge slip" positioned on top of it.

The record of the transaction included an impression of the embossed information, made by the imprinter pressing an inked ribbon against the charge slip.

This is the first six digits for Master Card and Visa cards.