I'm still quite new to the xenforo scene. I know that it is possible for forum members to pay for forum features like editing their own custom titles, sparkly username, more inbox space, and more. I'm wondering what types of addons can facilitate stuff like this? Not asking for you to advertise a given addon, debate what is best or w/e, I just don't know what these are called. If you could point me in a few directions, it would be greatly appreciated.