I want have two shopping carts in my site. One cart for products of type "A", second - for products of type "B"
I know it is possible by Commerce internal design.
for the first i created two modules (could be one, but that's not important right now).
first module adds custom Line Item Type into system - "photoprint"
second module adds custom Order Type - "photoprint"
But I have no good api skills and I have a few questions