Business::CreditCard These subroutines tell you whether a credit card number is self-consistent -- whether the last digit of the number is a valid checksum for the preceding digits. If you additionally want to process the credit card electronically, see Business::OnlinePayment Original author is Jon Orwant , The Perl Journal and MIT Media Lab Current maintainer of 0.38 (a fork of 0.36) is Lisa Shadow . Sorry, I had no way to open a pull request because couldn't find Ivan's repo anywhere and there is no contribution information on https://metacpan.org/contributing-to/Business-CreditCard His email is not working. Feel free to merge my commits back into your tree if you find it useful. Current maintainer of 0.36 is Ivan Kohler . Please don't bother Jon with emails about this module. Lee Lawrence , Neale Banks and Max Becker contributed support for additional card types. Lee also contributed a working test.pl. Currently supported types VISA MasterCard Maestro Discover American Express MIR Dankort UnionPay JCB RuPay Troy UATP Verve InterPayment enRoute Solo Laser Isracard