[Search]Business Plugin

Hey, I’m starting to build a website for a little cheap tool i created, and i wanted to add a purchasing plugin like the EDD plugin, but it’s not that what i was exactly looking for, I want a plugin, where you need to login, than you can buy the tool, and than the account is registered to the page, where the user has acces to the update page…
I know it sounds difficult, but is there any plugin out there who’s able to solve this problem? If it would be free, that would be great!