According to inquiries on Xicai.com, we learned that the reasons why credit cards cannot be paid via WeChat include:

1. Reasons for the credit card itself: Some credit cards do not support binding WeChat to pay for consumption. This is Because the credit card issuer or card type does not support the WeChat payment function.

2. The credit card has not been activated for quick payment: If the credit card has not been activated for quick payment, payment cannot be completed through WeChat.

3. Insufficient credit card limit: If the credit limit of the credit card has been used up, the payment will not be completed.

4. Merchant reasons: Some merchants do not support the use of credit cards for consumption. This is due to reasons such as the merchant's payment system or card acceptance.

5. Network or system problems: If there is a network failure or system problem during payment, the payment may fail. At this time, you can try to check whether the mobile phone signal is normal, or try restarting the mobile phone and WeChat.