Why does CCB's online banking have a barrage to remind you to renew the validity period of your certificate?

In order to implement the Administrative Measures on Customer Identification of Financial Institutions and Preservation of Customer Identity Data and Transaction Records, and the Notice of the People's Bank of China on Strengthening Customer Identification against Money Laundering, CCB is carrying out the verification of individual customer identity information. As the validity of the identity documents kept by customers in CCB is about to expire or has expired, in order to ensure the normal use of customer accounts, CCB will remind customers through SMS, mobile banking, online banking, WeChat banking, intelligent teller machines, counters and other channels.

(In case of business changes, please refer to the actual situation. )