Memberpal
https://www.youtube.com/watch?v=TQExerTGM
Now if your a software developer you can create your own membership site by hand (ie type the code) for each of your products. This is the method I use (and frankly even though I can code fast, its still kind of a pain in the ass). If your not a developer than you will need to either hire someone to make a members area for each of your products or you will need a system that lets you create membership sites / areas without needing to code.
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