Click the+sign in the upper right corner of WeChat, select Add Friends to enter the Add Friends page, then select Find the official account of WeChat and enter "Bank of Communications" in the search bar.

Click the search button to search out all official WeChat accounts related to Bank of Communications.

Select the first "Bank of Communications Credit Card"

Click "Follow"

Return to wechat page

Click "Bank of Communications Credit Card"

Click Bind Credit Card Account.

Then follow the prompts to bind the credit card. I hope it helps you.