Our site sells a service, not products, but our hosting provider includes Zen-related eCommerce servers in our fees, so I'd like to leverage it if possible.

We would keep track of services used by our customer, and is there then a role that Zen can play in charging our customer's credit cards, which we would have already captured?

All the info is oriented toward traditional web browsing/buying but can Zen be used in other ways? Any other suggestions?