What is the account opening certificate? Is it one of the proof materials that you need to provide when you apply for a card? If this is the case, where do you apply for a card, you should provide proof that you live and work locally.

If you already have a CCB credit card, you need the bank to issue you a certificate that you have a CCB credit card. You can call the customer service hotline on the back of the credit card to apply. This business is local and off-site.