in that case, go for both. it allows you the most flexibility and you can go with epoch cascading to ccbill right away, which means some more sales than you would have had. what's more, while you could license NATS, i think beginning programs are helped by having the biller pay the affiliates directly, so perhaps it's to your advantage to start out with epoch cascading to ccbill.
and michael, i also remember hearing that ccbill is working on their cascading solution.
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