1. Abnormal credit card status: The credit card may be in abnormal status due to reasons such as expiration, loss reporting, freezing, etc. , so it is impossible to use the card to spend.
2. Trading environment problems: Some trading environments may have risks, such as network instability and POS machine failure, which lead to trading failure.
3. Insufficient credit line: Although credit cards have credit lines, the actual available credit lines may be insufficient, which makes it impossible to spend by credit card.
4. Risk control of credit cards by banks: Banks may control the risks of credit cards, such as suspected fraud and overdue repayment. , causing the card to be frozen or restricting transactions.