At least a couple hundred if you count all the ccbill, verotel, and epoch programs separately. But there's a core of about a dozen who I am most active with at any given time. Sometimes it's good to have those other sponsors there on the back burner even if you aren't doing a lot of volume with them at the moment. It gives you some familiarity with them and how they convert as a point of reference for if you later start another project.
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