Hello, I would like to suggest an add-on.
Center repayment or disputes. That is, if a customer wants to return a product or get your money back, a place to chat them and where the seller decides to return the money or not according to their policies.
All this for the administrator of the page knows if also returned his commission to the seller.
The best would automatically, that is, if the seller wants to return his money, the fee charged both paypal and stripe is also refunded.