In this picture taken on August 21, 2019 a woman uses a facial recognition device installed at an IFuree Go self-service supermarket in Tianjin. - China's mobile payment infrastructure is already among the most advanced in the world, but facial payment technology is bidding to make QR phone codes old-fashioned. The newest payment systems being rolled out across the country only require a person's face to make purchases -- no mobile, no cash, no wallet. (Photo by Nicolas ASFOURI / AFP) / To go with AFP story China-technology-retail, FEATURE by Helen Roxburgh