First of all, you use a visa dual-currency card, which can cost US dollars. Credit card is also a kind of overdraft card. You don't need to deposit dollars in advance. When you save money, you can spend $500 and then pay back RMB on your repayment date. Online credit card deposit is a visa special line for international consumption, which requires banks to open the international card-free shopping function of credit cards, that is, you don't need a password, but use the 3-digit code on the back of your card. This function is an international consumption pattern. This function can be enabled through the phone of the credit card bank. If you feel unsafe, you can notify the bank to cancel the card-free shopping function after depositing.

Then talk about the problem of repayment:

After spending dollars on credit cards, many banks can repay in RMB. You need to enable the automatic purchase of foreign exchange in US dollars. Those who have not enabled this function cannot purchase foreign exchange automatically. This function also requires you to call the bank customer service phone to apply for activation.