I'm looking for a 3rd party payment handling site to sell my software. Currently I have shortlisted Avangate (www.avangate.com) and Fastspring (www.fastspring.com). Fastspring seems to have the advantage for me on price and customer service.
However something I cannot understand is how to create an affiliate program using these sites, and which would be more effective for my affiliate program? Has anybody had any experience with creating an affiliate program with the above two sites, or any similar 3rd party payment sites?