Currency, in the form of Gold, Glam and Coins, is gained in a number of ways in City Girl Life.
You can increase your currency amounts through regular game play such as visiting friends, completing mission steps, leveling up, going to work, etc.
You also have the option to purchase additional currency from the "purchase" tab in the game or by clicking the plus sign next to each currency type.
Additionally, free Gold can be gained by clicking the "earn gold" button at the bottom of the "purchase" tab screen and completing offers. These offers are available through a third party provider.