There’s no cart option yet, but I’ll check if it’s possible to integrate it – it works without a cart at the moment because calculating commissions, managing orders and refunds would be complicated for orders that contain items from different vendors (there would be orders common for a few vendors). The Marketplace extension is more suitable for non-physical products because of this.
There would be no physical products, only downloadable. Customers want to buy multiple ebooks, printables, etc. and, yes, from different vendors. Only about 20% of the orders I get are for one item. Thank you for the reply. This may not be the solution I need.