Hi Ben,
I may be jumping the gun here but, Why can’t you build your items using the normal shopping cart IA but then once the process is done you take a snapshot of the cart outside of the scene area. Then convert the image to a PDF using ImageMagick and then import it back into Intuiface and attaching it to the share que?
With this method, you can design the receipt to whatever you like in Intuiface and do it that way?
I would be interested in wanting to know more about your scenario.
Kind Regards
Louie