People can use Alipay, Gaode Map or WeChat to scan the QR code, the Shanghai Municipal Transportation Commission says. (Picture: Shanghai Municipal Transportation Commission)
Shanghai introduces QR codes on subway to track potential contact with coronavirus
Big data helps China track people in fight against the coronavirus epidemic
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People can use Alipay, Gaode Map or WeChat to scan the QR code, the Shanghai Municipal Transportation Commission says. (Picture: Shanghai Municipal Transportation Commission)
