How can I collect all payments?

Hi there,

my client has a specific need. We are using global cart and Paypal Express Checkout (which is the only option for Global Cart, right?).

However, she wants to get paid for every product sold on her sub-stores and she will take care of forwarding the money to her store owners after deducting a percentage.

I have tried using the same paypal address for two different stores, but it doesn't seem to allow me.

I get this error on checkout:

"There was a problem finalizing your purchase with PayPal. Please go back and try again."

Is there a way to do what she needs?