Some info: we had a conversation with the OFN devs (in Porto) and @Sacha today and he is going to propose to build a standalone “shop” website consuming the OFN API to display and propose products for sale on a standalone website to his Ruby student fellows 
We will know early next week if the project is taken, it would be 4 students for 2 weeks full time on a prototype. So I would move to “discovery” if this project starts as it would fuel the brainstorming on our API solution for this use case.