I've been banging my head against the wall trying to implement what I need with membership. I've found tons of help out of your support system, but I think it's too much plugin for what I need.
Basically, I want a subsite on a subdomain to only be accessible to people who enter an invitation code. These people do not necessarily need to login to the main buddypress site.
I think it will be a lot easier for me to just make a custom form and check for a cookie. I would appreciate it very much if someone could tell me where to start looking for the place to throw a conditional block to implement this. I know how to code but it's been several years and I'm not familiar with wordpress process flows.
You will literally save my holiday season! Thanks