+types. Lee also contributed a working test.pl. Alexandr Ciornii
+<alexchorny@gmail.com> contributed code cleanups.
+
+=head1 COPYRIGHT AND LICENSE
+
+Copyright (C) 1995,1996,1997 Jon Orwant
+Copyright (C) 2001-2006 Ivan Kohler
+Copyright (C) 2007-2012 Freeside Internet Services, Inc.
+
+This library is free software; you can redistribute it and/or modify
+it under the same terms as Perl itself, either Perl version 5.8.8 or,
+at your option, any later version of Perl 5 you may have available.
+
+=head1 BUGS
+
+(paraphrasing Neil Bowers) We export all functions by default. It would be
+better to let the user decide which functions to import. And validate() is
+a bit of a generic name.
+
+The question is, after almost 2 decades with this interface (inherited from
+the original author, who probably never expected it to live half this long),
+how to change things to behave in a more modern fashion without breaking
+existing code? "use Business::CreditCard <some_minimum_version>" turns it off?
+Explicitly ask to turn it off and list that in the SYNOPSIS?
+
+=head1 SEE ALSO
+
+L<Business::CreditCard::Object> is a wrapper around Business::CreditCard
+providing an OO interface. Assistance integrating this into the base
+Business::CreditCard distribution is welcome.
+
+L<Business::OnlinePayment> is a framework for processing online payments
+including modules for various payment gateways.
+
+http://neilb.org/reviews/luhn.html is an excellent overview of similar modules
+providing credit card number verification (LUHN checking).