What are the currencies in Asphalt 8?

I'm curious, can you tell me about the currencies that are used in Asphalt 8? Are there multiple forms of currency in the game, and if so, how do players acquire them? Do they have any real-world value, or are they strictly in-game items? I'm eager to learn more about the economic system of Asphalt 8 and how it affects the overall gameplay experience.