Membership Affiliate Provider?

I'm currently developing a membership website targeting webmasters, companies, SEOs and other individuals. I have not put much thought into payment processing yet but do know that I want to include an affiliate program. My question is the following: Does anyone know a reputable company that offers an affiliate system for membership types of sites, handles (all) payment processing and does not take to much of a share for that? I'm thinking of a company that would handle both the affiliates and the sales on the site as it would reduce my work quite a bit. I'm also interested in individual payment systems that I could use directly on the site for sign up. Any help would be really appreciated and rewarded with at least a beta invitation and maybe even a free lifetime membership (if a suggested provider is selected to be the payment processor).