When you want to ride the subway in Wuxi open the APP and click "乘車掃碼" to get your QR code. [Photo provided to chinadaily.com.cn]

After three years of development, subway travellers in Wuxi can now travel without having to buy a physical ticket. Instead passengers simply need to scan a QR code and they can ride ticketless.

Simply download the app "碼上行" (ma shang xing), register yourself, and scan a QR code upon entering the subway. Check out the step by step guide.