rails validation plugin. validates credit card numbers (via checksum).
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README

ValidatesCreditCard
===================

Copyright (c) 2008 Stefan Natchev
Originally found at http://code.google.com/p/validates-credit-card/

Modifications by Paul Schreiber (http://paulschreiber.com/)
- can now pass :if and :unless to validators
- added method to detect card type based on card number (card_type_from_number)
- added list of card prefixes from "Credit card validation extension for jQuery Validation plugin"
	by Jack Killpatrick
	http://www.ihwy.com/labs/jquery-validate-credit-card-extension.aspx
	which is an enhancment of work by John Gardner
	http://www.braemoor.co.uk/software/creditcard.shtml

Last modified 15 September 2010