Ask most people in Sweden how often they pay with cash, and the answer is “almost never.” A fifth of Swedes, in a country of 10 million people, do not use automated teller machines anymore. More than 4,000 Swedes have implanted microchips in their hands, allowing them to pay for rail travel and food, or enter keyless offices, with a wave. Restaurants, buses, parking lots and even pay toilets depend on clicks rather than cash
https://www.nytimes.com/2018/11/21/business/sweden-cashless-society.html