1. The credit line is insufficient, so it is recommended that you spend within the credit line or use it after the credit line is restored after repayment;

2. The card status is abnormal, such as the card is damaged or the magnetic stripe is damaged, which makes the computer system unrecognizable. It is recommended to confirm the card status and try again.

3. The network environment is not good. If the line is busy or disconnected, the merchants cannot successfully obtain the authorization of the card issuer. It is recommended to try again later.

4. If the consumption limit of merchants is exceeded, such as Alipay and WeChat payment have different limits, it is suggested to try a small credit card or choose other suitable payment methods.