Why can't wechat bind the bank card to find the balance?

Wechat can't see the balance by binding the bank card, because these are two programs. If you want to check the bank card balance, you need to download the corresponding mobile banking. I take China Postal Savings Bank Card as an example. The specific operation is as follows:

1. First download a "Postal Savings Bank APP", as shown:

2. Then click "Postal Savings Bank", as shown:

3. Then click "My", as shown:

4. Then enter the password of mobile banking login. This interface cannot be crawled, so it will not be displayed.

5. Then click on my account to check the specific amount, as shown: