If you're using our application_fee parameter to take your own fee out of a transaction, you get the full amount you request. Both that full amount, and the Stripe fee for the charge, are subtracted from the total amount paid to the seller.
To illustrate, a $100 charge with a $1 application fee would end up sending $1 to the application, $3.20 to Stripe, and $95.80 to the seller.
If there are multiple parties involved in referring the sale, I will be charged not one but a multiple of the Stripe fees whenever money is disbursed to appropriate parties involved in one single sale.
Furthermore, because I have to process returns I will not be able to send the payment directly to the seller immediately. The payment would be retained in my account after a period of time before I could transfer it to the sellers.