Confirmation Page

When somebody buy our mailbox he or she will be readdressed to the PayPal confirmation page. This page has a message "your order is now complete " and at the bottom "Continue" button. This button has a link to our confirmation page. Usually users don't click on this continue button, because "order is now complete", correspondingly they are not readdressed to our confirmation page. It was our problem. Using PayPal parameters in the hidden form we changed the message on the button from "Continue" to "Finish your order". After that users started to click at this button. But more clean decision will be to use our own confirmation page instead of paypal confirmation page. I took paypal perl script that has to accept and verify POST from paypal, combined it with our html, put this script in cgi-bin directory and used for the name extension cgi. Then in the hidden form I placed a tag notify-url. I made everything that was described in paypal help and guides, but then still paypal confirmation page was shown. I don't know what was missed. I will try to investigate this issue.