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Answer
Shanghai’s international-services materials describe contactless bank cards at supported gates, supported transport apps, and single-journey tickets with staff assistance. Compatibility varies — do not rely on only one method on day one.
If using a metro QR inside Alipay/WeChat or a city transport app, complete registration while you still have data and a working payment method.
Keep small cash or a staff-ticket fallback for your first ride if the code fails.