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Why sometimes customer's wallet is required to Pin in the payment password?

Even though user's barcode is generated in real time, there's always some situation Alipay risk system detect customer's payment environment is not secure and also for our responsibilies to prevent customer's funding from being stolen, we will ask customer to do additional authorization by verifying his/her payment password or fingerprint, therefore the payment result may not be able to sync to merchant POS once verify customer's wallet, merchant should call query to retrieve the payment result asynchornously and make sure to void(reversal API) this transaction if the payment result is still vague eventually.

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