clarkwinkelmann I've been looking for something like this.
Heres in my point of view what you can include.
Users may register as a member and have member permissions. If you pay for a specific subscription (via paypal would be nice) get a permission added by the admin, Also As I see you are on flagrow, I could see being able to integrate a subscription with the flagrow ads so you could add specific members to not see ads. The reasons I think about making them permissions is the fact that is (In my point of view) easier for a dev to give a user a permission instead of others, And it's better to use flarum natively so I could restric/or grant access to certain subscriptions.