Direct Buyer To Seller Card Payment Gateway For Checkout?

Hello,

I operate a marketplace for cognitive enhancement supplements. Since not every product is FDA approved the big card processors, (Paypal, Dwolla, Square, Stripe, etc) refuse to work with us.

At the time being we can only facilitate Bitcoin payment for our buyers and vendors.

I'm looking for a card payment gateway that sends funds directly from users card to sellers bank account, or equivalent where seller can access funds. Then once payment is made we require the gateway to give confirmation that checkout has complete.

If anyone has an idea of a way to accomplish this, and/or would be willing to develop such a system, I will pay generously.

Eager for positive response,

Thanks