A microchip with a built in gps device, that will be controlled by the government that you will use as your digital wallet that holds your currency in a digital form. All other forms of currency will be outlawed.
The real question. Are you going to take the mark of the beast or are you going to become homeless and beg for food?
Well, I will be in dirt at that point.. and they can't do anything that GOD doesn't allow them to do. Satan still has to ask like a little dog what he can do to any human. That is why Job was written to assure us of that. Satan has 0 authority over us.