Call the customer service number of the bank where the credit card is located, first report the loss of the card, and then ask the customer service staff to issue a replacement for you.
The main credit card and the supplementary card share the same account, and the supplementary card enjoys all or part of the credit limit of the main card. Friends, you will understand, there is no consumption of supplementary card or main card money, all consumption is money from the same account.
The limit of the supplementary card can be the same as that of the main card (that is, the main card has no limit for the supplementary card), or it can be smaller than the limit of the main card (limit). If you are an supplementary card holder, you can only spend on yourself. The credit limit of the supplementary card, even if there is a large amount of credit available in the main card, cannot be consumed anymore, unless there is no limit. In this case, the supplementary card has the same limit as the main card and can be consumed in full. In fact, to put it more simply, the supplementary card is the little brother of the main card. If anything happens, the main card will have to fight it.
If the two cards are in the same account, you can repay either card. No matter which card is repaid, the repayment will be considered successful, and there is no need to repay separately. However, if neither the main card nor the supplementary card is repaid, then the main cardholder bears all responsibilities, such as interest, late fees, bad credit, etc. There is no need to pay for supplementary cards.