Hello, the transaction password is used for credit card consumption and withdrawal (withdrawal). Each credit card has a separate transaction password. If you use China Merchants Bank credit card, you will be locked by the system if you enter the wrong transaction password three times in a row. After the transaction password is locked, it will be automatically unlocked at 0 o'clock the next day. If you forget the transaction password, please call the service hotline to verify your identity and press 9 to handle it manually. If you have any other questions, it is suggested to add "QQ" or "WeChat" to experience the function of the "micro-customer service" platform of the credit card, or telephone manual service consultation. Method 1: Search for "4008205555" among QQ corporate friends and add "China Merchants Bank Credit Card Center" as a friend; Or WeChat search for "cmb4008205555" and pay attention to China Merchants Bank Credit Card Center. Method 2: Please call the credit card customer service hotline 8008205555 (fixed telephone only) or 4008205555. The cardholder should directly enter the ID number and inquiry password-then select "9" to enter the manual service. Thank you for your attention and support!