This function checks card numbers against the MOD10 algorithm, as well as checking card specific features for Mastercard, Visa, American Express and more.
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Credit Card Validation Solution
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Script Library
) : 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 that card. Processes American Express, Australian ...