Here are some notes that my company created in order to develop an integration system with ERP and marketplaces (eBay, Amazon, Wish, ManoMano, ePrice, Spartoo, Allegro, Aliexpress).
Consider that the company recently added indices that were missing in the first beta (if you look at the database you have already installed they are missing, but in the beta that they released to me in a project that I am developing, there are.. wait for the next public update).