1) The merchant's pos machine is abnormal, try another store;

2) The credit card password is incorrect, so it is recommended to try again;

3) If the credit card status is abnormal, you can call the customer service hotline on the back of the card to check whether your credit card status is abnormal, which leads to abnormal transactions.

Two. Introduction of CCB Credit Card:

1. CCB Credit Card is a credit card issued by China Construction Bank. The credit cards issued by China Construction Bank are all named "Longka", including: Longka Famous School Card, Longka Business Card and Longka Automobile Card.

2. Advantages of CCB Credit Card:

Annual fee-free policy: swipe your card for 3 times or 18 times (excluding special cards such as business cards and car cards) to avoid the annual fee for the following year.

Withdrawal fee: domestic: 5‰ of the transaction amount, with the lowest 2 yuan and the highest 50 yuan; Overseas: 3% of the transaction amount, with a minimum of $3.

Multi-account management: quota sharing, multiple CCB cards, one billing date and independent repayment.

Online payment: Alipay: it can be used after online registration, with a single payment and a one-day limit of 500 yuan.

Installment business: support interest-free installment for specific merchants (3, 6, 12). After a single consumption exceeds 1000 RMB, you can apply for installment by phone (3,6,0/2,0/8,24), and different handling fees will be generated for each installment according to the number of installments.

Billing date: There are multiple billing dates every month, and the cardholder can change it once a year within the validity period of the card.

Currency: RMB, RMB/USD, RMB/Euro.