Membership - integration issues with Facebook

Hi

Our dev roadmap includes running our site as a Facebook app however there may be a couple of potential issues with the Membership plugin.

We are using Membership as a paywall for the premium content of our site which includes a tournament game. As such, Facebook's terms are that all payments must be thru Facebook Payments.

http://developers.facebook.com/docs/payments/build/

The questions this raises are;

1. Can membership be developed to include Facebook as a gateway

If so, can we implement functionality to

2. Operate more than 1 paid gateway . . .
3. . . which would include detection if on Facebook and therefore only present this as the available payment method.

4. NB. Facebook Connect functionality would also be required.
We are using WPMU Facebook plugin but the Connect function does not seem to run thru into the Membership forms.

Any thoughts / advice would be helpful.

Thanks