1. Enabling Instant Payment Notification (IPN) within your Paypal account.
a) Log in to your Paypal account and click on the “Profile” link in the menu, then on the next page, click “My selling tools.”
b) Under “Getting paid and managing risk” section, click “Update” beside “Instant payment notifications”
c) If IPN is already enabled, and you already have a URL in that field, then skip ahead to Step 2.
Else, if IPN is not already enabled, then click on “Choose IPN Settings”
d) On the next screen, in the Notification URL field, enter…
Don’t forget to replace “YourSite.com” with your actual web site’s domain name.
e) Make sure “Receive IPN Messages” is selected.
f) Click on “Save”.