Coupons are a mobile form of Premium Time
You can purchase coupons, or get one for 2 days when your account reach level 15 and 30.
The advantage of coupons are that you can activate it when you see fit, or you can give it to other players.
After your premium account expires your account becomes a free account, are limited in some features.
Every new player starts off with an premium account lasting 5 days. After those 5 days, the account turns into a free account unless the owner of the account (or anyone else) upgrade it to Premium.
