Hello, Sorry for the delay in responding, I've been busy with other tasks. Yes, that's the right section to enter an address on an account and once the address is set as the primary address on the account, it would be returned to a merchant / business account which has the option to receive the buyer's billing address. In regards to the add address section not showing the option to enter a country, as the account is a U.S. account, the country would / should default to the U.S., but there appears to be something wrong here if you're seeing that error. I'll need to re-produce the issue myself and submit a request internally for the issue to be reviewed. A sandbox account should come with a default primary address added, so you shouldn't need to add one in order to be able to retrieve the address as a merchant / business account with the ability to receive a buyer's billing information. Thanks !
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