PayPal's IPN is a system that effectively "talks" to your web site, cross referencing a few key variables from your PayPal purchase button to ensure your visitor actually bought your product, before sending them to your Download/Thank-you page
To be really secure you need to do two things
Use Paypals IPN service to double check that payment has been made.
Secure your download page so that even if I give you the address you don’t get the download link unless you’ve paid.
Without PayPal's IPN system, your PayPal buttons are susceptible to being tampered with, or your Download/Thank-you page can be found and viewed directly. Here are some of the ways your Digital Products can be obtained when using PayPal but Not when using PayPal IPN:
Someone can find and view your Download/Thank-you page without paying
Your buyer can share your Download/Thank-you page with whomever they want
A sneaky potential buyer can tamper with the amount paid for your product, possibly buying it for as little as $0.01!
Or they could easily tamper with the "business" value in your PayPal Button and effectively pay themselves for your Product!
Your buyer could easily sell your Product themselves, sending their buyers to your Download/Thank-you page!
With our Instant IPN Generator
All you need is a copy of your PayPal button you'll be using for your web site.
Simply Copy & Paste your button code into the software, fill in a few more tidbits of information, click the Generate button and the Instant IPN Generator will give you everything you need to use PayPal's IPN system and also further secure your Download/Thank-you page.
Because your download page will be specially protected in an expiring page that will only allow the buyer to download until they close their browser window. They won't be able give out your Download/Thank-you page.
They can't give the URL to others or bookmark it because The Instant IPN Generator creates an additional special Script that effectively "wraps" your current Download/Thank-you page in an expiring web page.
The script hides the location of your real Download/Thank-you Page. Your buyer will never see your actual Download/Thank-you page URL...ever!
Sound too good to be true? Its Not!