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I think credit cards have an expiration date because it gives them a contractual âoutâ by saying a contract was only for a stated period and not an open-ended contract. The magnetic strip is a bunch of hogwash. The credit card companies do not want to send out millions of cards just because they might wear out.
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.