there are two main reasons why wechat binds a bank card. one is that wechat needs real-name authentication after registration. after registration, we need to input personal identity information for real-name authentication. after completion, we need to bind a bank card to further confirm personal information and complete real-name authentication.

the other one is wechat with a bank card, which is more convenient for wechat payment in daily life. We can directly use the money in the bank card for wechat payment.