Billing address, etc. are usually credit card information, and the visa channel is used to verify the user's true identity.

So this must be your classmate’s address, and it is the address he used when applying for the card. If it is a domestic visa card, it is most likely his domestic home address.

To put it simply, 1 is his address, and 2 is the address he used to open an account, not his current address. 3billing country is the country where the account is opened. 4. In addition, the 3-digit authentication code must not be mistaken. 5. The name and card number must be strictly the same and do not write them backwards (uppercase or lowercase does not matter, titles such as mr ms are not required).

The address where you receive the textbooks is called the mailing address, which you will be asked to fill in after payment is made.

How to distinguish billing vs mailing

If you still can’t figure it out, you can only change the card.