I recall nothing that suggests that physical currency is still a thing. I think its all digital now. Mind you, most people in the setting have easy access to a computer; most have mesh inserts. The exception might be zeros (people without mesh inserts or ectos). Because they lack computers, they might need some other form of currency. Mind you, they are often people who are indentured, so they likely have a hypercorp who has a vested interest in keeping them effective workers. They will probably take care of all financial needs (and rig the system to keep them indentured longer).