Since 2019 e-tickets mean your passport is the ticket. Open the app, or ask the window to look you up.

Your passport is the ticket — no paper needed.
If you cannot find your booking, you do not need paper — the passport is the ticket:
China uses e-tickets tied to your passport. Your booking lives in the 12306 or Trip.com app under My Orders, and the station can look it up by passport number.
Every case shows the diagnosis and the first step - free. The full step-by-step fix for this exact case, the decision tree, and the offline kit are $9.99.
The kit gives the My Orders path per app and the window lookup script, so a lost phone is not a lost ticket.
Exactly where the e-ticket QR lives in 12306 and Trip.com.
When the window lookup works vs when you need the app.
The path as a printable card.
The notice is on the wall. The parcel still has your name on it.
One question, two paths. Your answer picks the road.
When the app says no, the counter can always say yes.
If the window cannot find your booking:
Four levels deep — a closed gate is never the end of the trip.

Station staff can usually solve in one minute what the app refuses to.
Most travellers know about three of these before they fly. This one is often not one of them.
Verified against these sources on 2026-09-20.