The merchant does not support credit card payment, the available credit limit of the credit card is insufficient, the credit card exceeds the payment limit, the credit card status is abnormal, etc.

1. Merchants do not support credit card payment: Some merchants accept WeChat payment, but in some cases, such as when paying the merchant by scanning a QR code, generally only a debit card can be used, not a credit card. Scanning the QR code to pay is equivalent to transferring money, and credit cards cannot transfer money.

2. Insufficient available credit card limit: Credit card consumption can only be made when the available credit card limit is sufficient. If there is no available limit on the credit card, or the product amount is greater than the payment amount, when the merchant uses a QR code scanner to scan the payment code, there will be insufficient credit and the payment will fail.

3. Credit card payment limit exceeds: Credit card WeChat payment has a certain limit. This limit is divided into three types: single limit, single day limit, and single month limit. The specific limit is subject to bank regulations. Each Each bank has different limits. If the limit is exceeded, payment cannot be made. For example, the single transaction limit for a China Merchants Bank credit card is 30,000 yuan, while the single transaction limit and daily limit for a Bank of Communications credit card are both 10,000 yuan.

4. Abnormal credit card status: If the credit card is frozen, payment stopped, etc., it may also result in the inability to pay normally.