They came in various shapes and sizes; with materials made out of celluloid (an early type of plastic), copper, aluminum, steel, and other types of whitish metals.Each charge coin usually had a little hole, enabling it to be put in a key ring, like a key.
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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.
Charga-Plates speeded back-office bookkeeping and reduced copying errors that were done manually in paper ledgers in each store.
Many modern credit cards have a computer chip embedded in them as a security feature.
In addition to the main credit card number, credit cards also carry issue and expiration dates (given to the nearest month), as well as extra codes such as issue numbers and security codes.
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.Both of these standards are maintained and further developed by ISO/IEC JTC 1/SC 17/WG 1.Credit cards have a magnetic stripe conforming to the ISO/IEC 7813.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 sometimes led to a case of mistaken identity, either accidentally or intentionally, by acting on behalf of the charge account owner or out of malice to defraud both the charge account owner and the merchant.