No offense intended (most of us were born without any knowledge of Perl), but...
for your own protection... and the protection of anyone using your site, please, before you commit to doing business using Perl, Paypal, and the web, read enough about Perl that you have some clue about its basics.
Some suggestions:
- Learning Perl
- Getting Started with Perl (on site Tutorial)
- Web Programming (on site Tutorial)
It would also be well to read the directions at the text input box as they pertain to formatting questions here -- roughly, use <c> ... </c> around your ... data