What is the best alternate aside from clickbank

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Hell guys. I would like to know what is the best alternate affiliate income stream aside from clickbank?. Clickbank is nice but I believe they doesn't accept paypal. I also tried signing up with paydotcom but it seems that there is some kind of a problem. After I signed up, it doesn's show any error message but, when I tried to log in, it says that I am not registered yet.