Hello, if you are referring to the visa verification service, please open the URL on the back of the card. There is online banking login on the right side of the page. After logging in, select the sixth item "Online Payment" in the horizontal menu—— Then select the payment function application, and there is a visa verification service activation interface on the interface.

If you have other questions, please open the China Merchants Bank homepage www.cmbchina.com and click "Online Customer Service" in the upper right corner to enter the consultation.