Many banks auto-block China-originated charges as fraud. A quick call or travel notice usually clears it.
Your bank, not the app, is blocking the charge.
If a charge is declined the instant you pay, and your card works elsewhere, your bank is the likely blocker:
Banks run automated fraud models that flag sudden charges from a new country. The Chinese app is not rejecting you — your bank is protecting the card.
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Some banks need a specific phrase to lift a China block permanently.
Exactly what to say so the block lifts for the whole trip, not just one charge.
Which banks block most often, and which need a travel notice vs. a per-charge approval.
The script and a note of your travel dates as a printable card.
If your bank cannot lift the block in time:
Most travellers know about three of these before they fly. This one is often not one of them.