In the case where the service recipient is not convenient to provide information at that time The staff can have the service recipient take a photo of the QR code to evaluate the quality of the service later.
If it is not convenient for the customer to provide information at that time, the staff can ask the customer to take a QR code photo. In order to evaluate service quality in the future.
When the client is inconvenient to provide information at that time, the authorities can provide QR code photos to the client for future service quality assessment.