1. Card is frozen, stolen or used abnormally, or the overdraft is overdue.
2. The card status is abnormal, such as degaussing or locking due to too many password input errors.
3. If you hold an IC chip credit card, the POS signal is not good, and the off-line transaction will fail.
4. Cards do not support transactions, such as VISA single logo /JCB single logo cards, and do not support UnionPay transactions or some online transactions.