83467 Small payment escrow system

We want a basic payment/escrow system. the user will register (email will be username) and be able to send/request/receive payment. (escrow, so any funds sent will be "pending" till payment relesed) we will need to be able to assess fees, to bouth parties (one a flat fee and the other a percent both on a sliding scale).It will need to intergrate into paypal and then have an invoicing system. We will want an affiliate program, that will credit the user a % of the fees paid by the refered user. and we would like "bonus cash" witch can ONLY be used for paying fees. upon selecting of programer we will proved all detials so you know exactly what is neeed (after a NDA is signed), please feel free to ask any question for claification. we will own the rights to the script.