Blidz Cash is a virtual currency within Blidz. However, it has a 1-to-1 value and currency to the real-world money. As such, it is denoted the same way as real-world money, e.g. $100 (USD) or A$100 (AUD) or C$100 (CAD).
Blidz Cash is only used in association with the acquired currency. So if Blidz Cash is acquired in USD, it can only be used with USD purchases.