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 <http://www.420.am/business-onlinepayment/>
Original author is Jon Orwant <email@example.com>, The Perl Journal and MIT
Current maintainer is Ivan Kohler <firstname.lastname@example.org>.
Please don't bother Jon with emails about this module.
Lee Lawrence <LeeL@aspin.co.uk>, Neale Banks <email@example.com> and
Max Becker <Max.Becker@firstgate.com> contributed support for additional card
types. Lee also contributed a working test.pl.