Country the goods are to be shipped to.
For Visa transactions, this property contains the three-digit numeric code of the country where the goods are being shipped. These codes are specified by ISO-3166. For the United States, use "840".
For MasterCard transactions, this property should contain the three-character alpha code specified by that same ISO spec. For the United States, use "USA".
This property is used for both Visa and MasterCard Corporate Purchasing Cards.