User Manager/Prepaid and unlimited users

There are two types of users - prepaid and unlimited.

Prepaid users

Prepaid users have at least one credits assigned. They can also have uptime-limit.

Unlimited users

Unlimited users don't have any credits assigned. Word unlimited comes from the fact that they have unlimited credit. However uptime-limit can be assigned to unlimited users. It means, unlimited users can have limited duration for active sessions but these sessions can be started in an unlimited period of time.