Products: Virtual (Simulate to be actions of micro enterprises)
I'm using Qr files as payment method which are just downloadable files I prepared for 8 items (enterprises) on my store.
The fact is that people can buy up to 3 (actions) of each item. But the Qr image has to change when 2 or 3 actions are purchased. Otherwise they will buy 3 actions just paying for 1.