If the supplementary credit card is used in a foreign country, funds cannot be transferred directly to the supplementary card in China. According to the relevant information of the supplementary credit card, we know that the commonly used credit cards are UnionPay, Visa, and Mastercard (MasterCard). UnionPay cards need to be used at the corresponding UnionPay card machines abroad. The limit of the supplementary credit card is in China. It has been set up. After spending abroad, the corresponding amount will be deducted according to the exchange rate. When repaying, if you use UnionPay to spend, you can pay it back directly in RMB. If you use a dual-currency card to spend, the RMB consumption will be included in the RMB account, and the foreign currency consumption will be included in the account. To deposit into a foreign currency account, you need to return the foreign currency. Cardholders can purchase foreign exchange and repay after returning to their country, or activate the card issuing bank to automatically purchase foreign exchange and repay. You can also enable the RMB deposit function for foreign currency consumption with the card issuing bank. After activation, the foreign currency consumption will be automatically converted into RMB amount according to the exchange rate of the day on the day of entry, and you can pay it back in RMB.