A port of creditcard_js to remove library dependency.
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creditcard.js

README

Originally based on creditcard.js for underscore.js, written by Thomas Fuchs.

This version requires no third-party libraries.

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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Copyright (c) 2012-2013 Jarvis Badgley - http://chipersoft.com/
Copyright (c) 2008-2012 Thomas Fuchs - http://mir.aculo.us/

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.