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This was extracted from http://letsfreckle.com. You need to be using a recent-ish version of the Prototype JavaScript framework. CreditCard.validate('1111 2222 3333 4444') -> true/false the given string is automatically stripped of whitespace, so it can be plugged directly into form validations The following things are tested: 1. does the luhn validation code add up? (see http://en.wikipedia.org/wiki/Luhn_algorithm) 2. does the number range and length seem right? (see http://en.wikipedia.org/wiki/Bank_card_number) 3. is it one of several well-known test numbers? Card identification via CreditCard.type(string) -> "Visa", "MasterCard", etc. Also, CreditCard.isVisa(string) -> true/false (works for all cards given in CARDS) Be sure to adapt the CARDS array to the credit cards you accept.
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