Okay... I've been reading up on this on this forum and it doesn't mention PayPal IPN activation anywhere.. at least the posts I've read. However, in my ZenCart Book I have, it says the below when dealing with PP Express:

"To use PayPal Express Checkout, install and enable this module. This module requires PayPal API credentials and CURL enabled on your server. First, request an API key in your PayPal profile and keep the credentials at hand, and then check that CURL is enabled on your server. If your server uses a CURL proxy, get that proxy
address. Also ensure that the IPN is enabled, and the IPN URL is provided in your PayPal profile.

Hence my question. Is that correct? Do I need to activate IPN in my PayPal account? And with what Notification URL?

Thanks
Yolanda