This assumes that you have setup the default client, or will inject your own client.
You can't create, update or delete users via the API this needs to happen only via Clubhouse web
epic = Clubhouse::User.find(3)
=> #<Clubhouse::User:0x007ffcd58002d0 @disabled=false, @id=3 ... >
Returns a list of all users
Clubhouse::User.all
=> [#<Clubhouse::User:0x007fb142170e58 @name="Tester", @deactivated=false,..>, #<Clubhouse::User...>]