1. The credit card (debit card) line of China Merchants Bank is insufficient, and the credit line has been used up. After repayment, it cannot be used again before the credit line is restored;
2. The transaction amount of China Merchants Bank's credit card (debit card) is limited in a single transaction, one day or a certain transaction channel, and it needs to be split into multiple transactions or the next day's transactions, or it needs to be traded through different merchants or POS machines;
3. Bank risk control. Credit card (debit card) quota is frozen, so you need to contact the bank to apply for unfreezing.