Registration link with custom capabilities???

Alright, so here’s the issue. I originally designed my site to function using only s2 member to sell memberships, each of which would come with one of our products. Now its been redesigned to have an online shopping cart on the site that does all of the card processing. When someone purchases our detox, they get access to the detox section of our site so that they can get their eating regimen and detox recipes. We also have a life maintenance program that when they purchase they need to get access to the life maintenance regimen and recipes.

Basically I need a link that I can send out in the “thank you for your purchase” email that goes out to our customers after buying the life maintenance program that will allow them to register with custom capabilities so they can get access to the life maintenance page, but not the detox page. I figured out how to make the link, but it only works once, then expires.

tldr:
***Is there a way to make a registration link that gives custom capabilities to specific pages that doesn’t expire?

I really need help on this one guys. My products are launching in less than 2 weeks and I need to have my site done. Any help is greatly appreciated.