First off cascading billing is the least of the great features of nats and the other available softwares. Keep in mind with 3rd party processors you can't really have seamless cascading because you can't carry the CC info through to another biller.
CCbill gives you the option of a redirect URL when a transaction is denied after X amount of attempts, so you technically don't need any software for cascading billers.
I think what i said is correct lol
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