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Description: Ensures credit card numbers are keyed in correctly. Includes checks that the length is correct, the first four digits are within accepted ranges, the number passes the Mod 10 Checksum and that you accept the given type of card. Just to be clear, this process does not check with banks or credit card companies to see if the card number given is actually associated with a good account. It just checks to see if the number matches the expected format.
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