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<HTML>
<HEAD>
<TITLE>C<Business::CreditCard> - Validate/generate credit card checksums/names</TITLE>
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<TR><TD CLASS=block VALIGN=MIDDLE WIDTH=100% BGCOLOR="#cccccc">
<STRONG><P CLASS=block> C<Business::CreditCard> - Validate/generate credit card checksums/names</P></STRONG>
</TD></TR>
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<A NAME="__index__"></A>
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<UL>
<LI><A HREF="#name">NAME</A></LI><LI><A HREF="#supportedplatforms">SUPPORTED PLATFORMS</A></LI>
<LI><A HREF="#synopsis">SYNOPSIS</A></LI>
<LI><A HREF="#description">DESCRIPTION</A></LI>
<LI><A HREF="#author">AUTHOR</A></LI>
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<P>
<H1><A NAME="name">NAME</A></H1>
<P><CODE>Business::CreditCard</CODE> - Validate/generate credit card checksums/names</P>
<P>
<HR>
<H1><A NAME="supportedplatforms">SUPPORTED PLATFORMS</A></H1>
<UL>
<LI>Linux</LI>
<LI>Solaris</LI>
<LI>Windows</LI>
</UL>
<HR>
<H1><A NAME="synopsis">SYNOPSIS</A></H1>
<PRE>
use Business::CreditCard;
</PRE>
<PRE>
print validate("5276 4400 6542 1319");
print cardtype("5276 4400 6542 1319");
print generate_last_digit("5276 4400 6542 131");</PRE>
<P>Business::CreditCard is available at a CPAN site near you.</P>
<P>
<HR>
<H1><A NAME="description">DESCRIPTION</A></H1>
<P>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.</P>
<P>The <CODE>validate()</CODE> subroutine returns 1 if the card number provided passes
the checksum test, and 0 otherwise.</P>
<P>The <CODE>cardtype()</CODE> subroutine returns a string containing the type of
card: ``MasterCard'', ``VISA'', and so on. My list is not complete;
I welcome additions.</P>
<P>The <CODE>generate_last_digit()</CODE> subroutine computes and returns the last
digit of the card given the preceding digits. With a 16-digit card,
you provide the first 15 digits; the subroutine returns the sixteenth.</P>
<P>This module does <EM>not</EM> tell you whether the number is on an actual
card, only whether it might conceivably be on a real card. To verify
whether a card is real, or whether it's been stolen, or what its
balance is, you need a Merchant ID, which gives you access to credit
card databases. The Perl Journal (http://tpj.com/tpj) has
a Merchant ID so that I can accept MasterCard and VISA payments; it
comes with the little pushbutton/slide-your-card-through device you've
seen in restaurants and stores. That device calculates the checksum
for you, so I don't actually use this module.</P>
<P>These subroutines will also work if you provide the arguments
as numbers instead of strings, e.g. <CODE>validate(5276440065421319)</CODE>.</P>
<P>To install this module, change directories to wherever
your system keeps Perl modules (e.g. <CODE>/usr/local/lib/perl5</CODE>) and
create a <CODE>Business</CODE> directory if there's isn't one already.
Then copy this file there. That's it!</P>
<P>
<HR>
<H1><A NAME="author">AUTHOR</A></H1>
<P>Jon Orwant</P>
<P>The Perl Journal and MIT Media Lab</P>
<P><A HREF="mailto:orwant@tpj.com">orwant@tpj.com</A></P>
<TABLE BORDER=0 CELLPADDING=0 CELLSPACING=0 WIDTH=100%>
<TR><TD CLASS=block VALIGN=MIDDLE WIDTH=100% BGCOLOR="#cccccc">
<STRONG><P CLASS=block> C<Business::CreditCard> - Validate/generate credit card checksums/names</P></STRONG>
</TD></TR>
</TABLE>
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