The difference between the primary card and the secondary card:

1. The main card bears the main repayment responsibility.

2. With the consent of the main card, you can apply for a supplementary card for others.

3. The main card can limit the monthly usage quota of the subsidiary cards.

4. The master card can handle all the business of the subsidiary card, including data change, card opening and cancellation, while the subsidiary card can only handle the business of the subsidiary card, not the business related to the master card.

5. The bill of the supplementary card and the bill of the main card are recorded on the same bill and sent (sent) to the cardholder of the main card. The billing address only leaves the address of the main card, and the letters of the auxiliary card are sent to the billing address of the main card.