Chip in the body

I believe that the trend goes in the direction of fictitious currency. Whether PayPal or credit card through enjoyment it is difficult to say. Currently I have a feeling that in Germany, anyway all the money transfer agents are networked with each other.
Perhaps it creates an organization who reduce all of paymant methods to one. And perhaps we will don't have cards, number, or other more in the futuer, but have all the world a unique ID that is implanted on a chip in the body. In Baja Beach Club in Rotterdam some guests can pay with a chip in the upper arm.
If we have more possibilities of RFID Thechnologie to do so, we are in the future and only need to pay our bodies in order to open doors or to travel ...