use Marketpress as a front end and CCBill as a backend payment processing solution

Does anyone know the best way to use Marketpress as a front end and CCBill as a backend payment processing solution? I have a client whom Im building a site for and I suggested wordpress with Marketpress as the eCommerce solution, but the client uses CCBill. It is primarily digital downloads, and hard products. Can I use a link in Market press to direct the customers to the CCBill experience?