What you pay attention to on WeChat is the credit card binding after CCB, right? I went to the credit card website of CCB, and the preferred account was explained as follows: "If you hold multiple credit cards, you will be asked to choose a commonly used credit card account as the" preferred account "when binding. When handling business in the future, the preferred account will be given priority by default. " In other words, you set up a preferred account, and the first thing you can query through WeChat in the future is this card information. If you want to inquire about other cards, just switch. If you still have questions about binding, you can log on to the credit card website of CCB, click "Frequently Asked Questions" and select "WeChat Service" to answer them.