Hello, I am an employee of Bank of Communications. I hope I can help you. First of all, if only one piece is associated, the credit card inquiry can only use the online banking user name and password of the debit card, and cannot be paid. If you want to pay, you must open an independent online bank, and you need to enter the verification code and the validity period of the card when shopping. This requires special attention. Other uses are the same as debit cards. I hope you can use it conveniently.