If you'd only be paying for an E-junkie subscription to have access to our affiliate network, you would probably want to set up your E-junkie Buy Now buttons for ClickBank on your own sales site to handle most CB and E-junkie affiliate-referred sales, and just set up an E-junkie Shop page on our site to recruit existing E-junkie affiliates.
This would help ensure that buyers referred to your site by CB affiliates could not wind up placing their order through any non-CB checkout method (which would stiff the CB affiliate on their commission). As long as the buyer uses an E-junkie button to place their order, any E-junkie affiliate who referred them should earn a commission, and as long as the buyer goes through a ClickBank checkout, any CB affiliate who referred them will earn commission; thus, using E-junkie Buy Now buttons for ClickBank on your main sales site would cover both cases.
This help page explains how to integrate E-junkie with ClickBank:
http://www.e-junkie.com/ej/selling-with-clickbank.htm
Note that you must first get the product set up and approved at CB's end with a dummy thank-you page on your own site, then once they approve the product, you can edit it to use our thank-you page URL instead.
This help page explains how to post product listings in your E-junkie Shop:
http://www.e-junkie.com/ej/help.promote.htm
The primary purpose of this Shop listing would be to recruit existing affiliates in E-junkie's system, who can search our Marketplace for listings with affiliate programs they may wish to join. Although some buyers may use the non-CB purchase button in your Shop listing, this would not be a significant sales channel for you.
This help page explains our affiliate system and related settings:
http://www.e-junkie.com/ej/help.affiliates.htm
Note you would want your affiliate hop links directing buyers to your main sales site where you're using E-junkie Buy Now buttons for ClickBank (rather than directing buyers to your E-junkie Shop on our site).
We also have a help page for affiliates, explaining the system from their perspective:
http://www.e-junkie.com/ej/help.for-affiliates.htm
After we process the order, if you want our system to forward the order data to a custom/third-party script (e.g., to manage subscriber/membership status and video access), that would use our standard Integration method:
http://www.e-junkie.com/ej/help.integration.htm
You might also find these WordPress membership plugins useful:
http://www.e-junkie.com/ej/tips.integration.membership.htm