Photo 1：A customer uses face-scanning payment at a supermarket in Chengdu, capital of southwest China's Sichuan Province, Sept. 14, 2018. Thousands of Alipay face-scanning payment machines are expected to be put into use in Chengdu at the end of this year. (Xinhua/Jiang Hongjing)

Photo 2：A customer holds a receipt after using face-scanning payment at a supermarket in Chengdu, capital of southwest China's Sichuan Province, Sept. 14, 2018. Thousands of Alipay face-scanning payment machines are expected to be put into use in Chengdu at the end of this year. (Xinhua/Jiang Hongjing)

Photo 3：A customer uses face-scanning payment at a supermarket in Chengdu, capital of southwest China's Sichuan Province, Sept. 14, 2018. Thousands of Alipay face-scanning payment machines are expected to be put into use in Chengdu at the end of this year. (Xinhua/Jiang Hongjing)