Currency is called Bios. Bios can be earned through revenue sources. Or it can be earned through gaining civilian money and converting it; the conversion rate is: $1000 -> 100B. With bios, you can buy general items from the system shop, and you can buy hideout upgrades.
Moving on
Revenue sources. THESE ARE KEPT TRACK OF ON THE FORUMS!
In short these are ways for your character to earn a certain amount of bios in irl time. Depending on what source is bought, the bios gained is generated either hourly or daily. For example: buying a supermarket or apartment is daily income, while buying a corner store is hourly income. These sources are based off of common sense, so USE IT; the larger a source, the more it generates, the more you have to wait.
A store and hideout upgrade center will be opened in a separate thread.
Please note that Some Sources Might Have A Weekly Collection Timer, but They Are Not Yet Implemented, Nor Will They Be For The Time Being. Thank You.