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Credit Card Verifier
This program verifies all 13 and 16 digit Visa Cards, 16 digit MasterCards, 16 digit Novus (Discover) cards, and 15 digit American Express cards. The program is to identify bad cards based on syntax errors, but not to verify that a card is good.
Perl/Ecommerce
http://www.worldwidemart.com/scripts/ccver.shtml
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