DominiqueD,
Do this : Don't trust your webmasters to answer billing and cascade questions. Instead, trust the people who actually provide the service.
Contact your rep at CCBill and ask them what you need to cascade. Then contact a compatible billing company such as Segpay, and sign up with them. CCBill will cascade to Segpay and vice-versa. Both of these companies work together to help you maximize your traffic and keep your declines to a minimum.
http://www.ccbill.com
http://www.segpay.com
Good luck!