User Management

hi all,

so those features http://docs.coronalabs.com/api_web/api/users/index.html here are all free with unlimited calls.

Am I right that if I want to save user specific data like game progress or coins, I need to create/update a box, so this user action is “paid”?

That would mean if I want the user to be able to play on different devices, I need to pay monthly for him playing? Like having a Premium game, but having monthly costs for that.