Hello @irenella,
We have not done this ourselves recently. Can you please point us to any documentation covering what you have tried so far?
If you are able to track when a user visits a particular URL, then you can assume that a user purchased a membership when they land on your Membership Confirmation page. The level that they checked out for will also be included in that URL. For example, if your membership confirmation page is yoursite.com/membership-account/membership-confirmation/, if the user checked out for level ID 1, they will be sent to yoursite.com/membership-account/membership-confirmation/?level=1.
Otherwise, custom code would likely be needed to integrate the Pixel Your Site plugin with Paid Memberships Pro.
If you have other specific questions on how to detect when a particular event happens in Paid Memberships Pro, please let me know.
