Finish setup while the connection is predictable
Add an overseas card to the wallet you plan to use, complete any identity checks and test the flow before you leave. Keep confirmation screens or help links available offline.
A travel eSIM can provide data for payment apps, but it cannot fix an account verification issue that was never completed.
Keep two fallbacks
Payment support varies by merchant and terminal. A second path is part of the plan, not a sign that the first one failed.
- Carry a physical card and know whether your issuer requires travel notices.
- Keep a small amount of local cash for low-tech moments.
- Save your hotel address in Chinese so a driver or station staff member can help even when an app is slow.