Metro systems in big Chinese cities are extensive and cheap: single fares run 3-10 yuan, reaching airports, stations and major sights.
QR entry: open the "transport" feature in Alipay or WeChat, select the city to get a ride code, and scan at the gate - fare is deducted automatically.
Other options: paper tickets and transit cards for those less phone-savvy; Apple Pay and UnionPay NFC work in many cities.
Transfers and exits: station signs are clear, follow the coloured lines for transfers. Big stations have many exits (e.g. Beijing Xizhimen, Shanghai People Square) - confirm your exit before tapping out.
Buses: 1-2 yuan, scan or pay cash on board, press the bell before alighting (exit at the rear); some cities offer free transfers.
Practical tips: download an offline metro map app (like MetroMan); last trains run around 22:30-23:30 - check ahead for red-eye flights.
