Aaron,
The major CC Processors have turnkey affiliate programs you can use when you set up your CC Processing account. iBill, CCBill, and Paycom/Epoch have "off the shelf" solutions for you. Call them today.
If you're interested in running an ARS/ATN/TOPBUCKS type of program there are tracking software available out there with accounting plug ins.
If you're running on an NT, I'd let you use my ASP COM component for free.
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Traffic NOT CONVERTING? Try This -- Converts 1:30