If it is the "Authorization Code" for China Merchants Bank Professional Edition, it is a 16-digit number given to you by the counter staff when you bring your valid ID and the debit card to be linked to a branch to apply for linking a new card to the Professional Edition. The authorization code is printed on the "Association Reply", and at the same time, the system will send the authorization code text message to your reserved mobile phone (Note: If you have not reserved a mobile phone number, it will not be sent). After you log in to the professional version, the system will automatically prompt you to enter this authorization code. Warm reminder: The authorization code associated with the professional version of the card is valid for 30 days. If it expires or is entered incorrectly five times in a row, the association will not be successful. If the authorization code expires or is lost, you need to bring your ID card or all-in-one card (mobile certificate requires UKEY ) Go to the counter to reapply for the associated authorization code.