curl --request GET \
  --url https://api.enterprise.sandbox.uphold.com/core/countries \
  --header 'Authorization: Bearer <token>'

{
  "countries": [
    {
      "code": "<string>",
      "name": "<string>",
      "asset": "<string>",
      "restrictions": [
        {
          "scope": "citizenship"
        }
      ],
      "subdivisions": [
        {
          "code": "<string>",
          "name": "<string>",
          "restrictions": [
            {
              "scope": "residence"
            }
          ]
        }
      ]
    }
  ]
}