Each credit card master card can apply for up to two supplementary cards, and the master card holder has the right to request cancellation of its supplementary cards. The credit limit of the secondary card shall be designated by the cardholder of the primary card independently, and shall not exceed the credit limit of the corresponding primary card; The credit limit of the supplementary card is the same as that of the main card.

All transaction funds, corresponding interest and expenses of the secondary card are included in the account of the primary card, and the cardholder of the primary card bears all repayment responsibilities. However, the primary cardholder and the secondary cardholder shall be jointly and severally liable for the debts owed.

Extended Data When a cardholder uses a credit card to make a large amount of consumption, the issuing bank will pay the consumption funds of the goods (or services) purchased by the cardholder to the merchant in one lump sum, and deduct the consumption funds from the cardholder's credit card account in stages according to the cardholder's application, and the cardholder will repay according to the monthly recorded amount.

In the past, credit card installment mainly included bill installment and single consumption installment, and banks usually charged corresponding handling fees according to the number of installments. Whether it is bill installment or single consumption installment, the premise is to generate consumption behavior first, and then the bank will set installment repayment for the generated credit loan.

Baidu encyclopedia-supplementary card