I've been messing around with a multi site install of MarketPress so that I can setup a marketplace for vendors to sell items, and automatically take a fee of each sale as commission for hosting the marketplace. So far MarketPress and the Paypal Chained payment feature seem promising. I've tested this and it does seem to work.
My questions are, can I set a different percentage or a fixed cost to deduct from each store?
How do you set the paypal address where the owner of each store will receive payment? The only way I could figure out was to manually log in to each store as the Super Admin and changing the Store Settings option. This setting was not available to the store dashboard unless logged in as admin.