I had posted in another thread but realized it was about add-ons, and i do not use add-ons for invoices.

I installed zencart 5 years ago and never thought much about the fact that the Paypal invoice does not list the items. It only says

"All the items in your shopping basket (see details in the store and on your store receipt).
Item# Creation Cassel Purchase"

I never thought much of it until i am considering using a tagging system for email list (Active Campaign) that takes the information from Paypal to tag users with whatever products they are purchasing. This would allow me to send promotional emails but only to those who might not have bought a particular item, or similarly, send something to those who specifically bought a particular product (maybe a product update, maybe a matching product, etc.)

So, i am not sure if there is something i should do or change or maybe even forgot to set up in order to get the list of items purchased.
I am using paypal express checkout.

Any idea? (or refer me to another thread?)

Thanks