Is there a way to integrate this with the Rules module? I am using this on a site where a teacher signs up and then give their students the registration code to sign up to their "classroom". To keep my site as user friendly as possible, I have a rule set up to create a group for them as soon as they create an account. So I'm looking into a way where I can have it randomly generate or use tokens to create a registration code.

Thanks for your help.