Because we are aiming to create a better experience for our players, we divided the clubs into three types:

1. Open clubs: any player could join this club with no need for approval.
2. Closed clubs: any player can join the club by sending a request, and it gets approved or rejected by the owner or the authorized  admins.
3. Private clubs: players only can join the club by invitation from the owner of the club or the authorized admins.