The supplementary card of a credit card (debit card) is handled by the main cardholder as the deputy cardholder, and the account share in the name of the main cardholder is the same, so it is counted as the credit of the main cardholder. After the supplementary card is consumed, it is included in the main card account, and the supplementary card holder can repay the supplementary card separately or directly from the main card holder.

If the minimum amount is not paid within the specified time after consumption, the supplementary card will be overdue and will be reported to the central bank for credit investigation, which will affect the credit record of the main cardholder.