The supplementary card of a credit card refers to multiple cards bound under the same account. Usually, the cardholder of the primary card is an adult in the family, while the secondary card is the card of other family members and relatives. The cardholder of the primary card can allocate the quota to the secondary card according to his own needs, and set various restrictions and trading rights. The credit limit and transaction record of the secondary card will be recorded in the main card account, and the main card holder can inquire and control it at any time.

Supplementary card is a special service of credit card, which can help family members achieve economic independence and consumer autonomy. Supplementary cardholders can enjoy the same credit card rights as the main cardholders, but they also need to bear the corresponding repayment obligations and use responsibilities. Therefore, as a supplementary cardholder, he should abide by the provisions and agreements of the credit card and actively maintain his credit record and loan image.

The choice of secondary card of credit card needs careful consideration, and the main cardholder needs to fully understand the card demand and personality characteristics of the secondary cardholder, as well as the credit card repayment ability and risk control ability. It is suggested that when setting up a secondary card account, a detailed use plan and budget should be made to avoid problems in credit card borrowing and repayment. At the same time, if the secondary card is improperly used or breached, it may have an impact on the credit rating and loan application of the main cardholder, so it is necessary to maintain good communication and consultation.