If you applied for the card using your personal information, the card is the primary card. If your family member applies for you, it is a supplementary card.

The main card and supplementary card of a credit card are generally applied for by one family. The main credit card holders are usually parents, while supplementary cards are usually applied for by parents for their children, but the children must be over 14 years old. The card types of the main card and the supplementary card must be the same, and the credit limits of the two credit cards are exclusive. After using the supplementary card for consumption, the bill will not be issued separately, but will be counted in the main card. In addition, supplementary cards can also enjoy the same annual fee discount policy as the main card.

Extended information:

The differences between the supplementary credit card and the main card are:

1. The annual fee for the supplementary credit card is half of the annual fee for the main card.

2. When repaying the principal card, the principal cardholder can repay all the outstanding balances on the account, while the secondary cardholder can only repay the amount owed by the secondary card.

3. The status of the secondary card and the primary card are different. The primary cardholder has greater rights and has absolute management rights over the secondary card.

Reference: Credit Card-Baidu Encyclopedia