List countries

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

{
  "countries": [
    {
      "code": "GB",
      "name": "United Kingdom",
      "asset": "GBP",
      "restrictions": [],
      "subdivisions": [
        {
          "code": "GB-BAS",
          "name": "Bath and North East Somerset",
          "restrictions": []
        },
        {
          "code": "GB-LND",
          "name": "London, City of",
          "restrictions": []
        }
      ]
    },
    {
      "code": "US",
      "name": "United States of America",
      "asset": "USD",
      "restrictions": [],
      "subdivisions": [
        {
          "code": "US-CA",
          "name": "California",
          "restrictions": []
        },
        {
          "code": "US-NY",
          "name": "New York",
          "restrictions": [
            {
              "scope": "residence"
            }
          ]
        }
      ]
    }
  ]
}