The reason is whether there is network, scene restriction, credit card abnormality and transaction limit.

1, no network: WeChat payment must have a network, and you can choose to use data traffic or connect to wifi.

2. Limited scenarios: Not all scenarios support credit card payment. If you scan the personal QR code instead of the merchant QR code, you can't pay by credit card.

3. Credit card abnormality: the credit card status needs to be normal, and the available amount in the card needs to be sufficient. If the credit card is subject to bank risk control, the transaction will fail.

4. Transaction limit: There is a certain limit for credit card WeChat payment, which is subject to the regulations of the issuing bank.