Hi,
From the description of your project, your have two accounts setup, one for a seller and another for an administrator, where you want payments from prospective buyers to be settled to both accounts in their proper ratio.
I have and currently working on a site which uses stripe to accept payments.
From my experience, I can accomplish this in a day by the following:
1. save the details of the settlement information, the amount charged, the application fee, and the sellers fee for later use in a database
2. accept payments into sellers account and include application fees for the administrator account(possible only for platform accounts and manual transfers), [duration: 3 hour]
3. test to ensure everything works fine.
You may contact me to discuss in detail how these will be completed and any further information needed.
Best Regards