The main card has one number and the secondary card has another number, but the secondary card enjoys the main card package. Some secondary cards can have unlimited traffic, but the main card has limited traffic.

These fees are borne by the principal cardholder. For people who do not have the capacity for civil conduct, they can apply for a secondary card, and their consumption will be borne by the primary card.

This kind of supplementary card is basically a card that parents will apply for for their children, or it is a card that they apply for for immediate family members through mutual assistance, which is very convenient. If there is debt on this supplementary card, the holder of the supplementary card still does not need to repay the debt, and only needs the main card to repay the debt.

Bank supplementary card:

Compared with the main card, a person who applies for the main card can freely transfer money, make deposits, purchase financial products, etc. These fees All are borne by the principal cardholder.

You can apply for a secondary card for them, and their consumption will be borne by the primary card. This kind of supplementary card is basically a card that parents will apply for for their children, or a card that they apply for for immediate family members through mutual assistance, which is very convenient. If there is debt on this supplementary card, the holder of the supplementary card still does not need to repay, and only needs the main card to repay the debt.

Reference for the above content: Baidu Encyclopedia-Supplementary Card