I work on multiple projects and these are all personal and just practice for me.
Two types of currency. Crowns, which you can acquire through normal gameplay methods and diamonds, which you obtain through actual cash purchase(s) or by logging in daily. Crowns will not be purchasable and diamonds will not be tradeable at all.
Code Sequence
x create crown currency
x shows up in player bar
x crowns are tradeable and +50 crowns given daily to user
x create diamond currency
x show up in player bar beside crowns
x diamonds are not tradeable and +1 diamond given daily to user