@kossa You could also take a look at Stripe Connect. It's built exactly for this purpose, marketplaces and multi-party payments, etc.
From a quick look at paypal (and braintree's) marketplace offering, they do have one potential problem. Everyone involved must be domiciled in the United States. If that is not a problem for your business, then go ahead and proceed, otherwise I'd definitely recommend looking into Stripe Connect, it will work in every country Stripe is located in.