curl --request POST \
  --url https://api.{tenant}.getomneo.com/api/v3/countries \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "<string>",
  "iso_2": "<string>",
  "iso_3": "<string>",
  "iso_numeric": "<string>",
  "sort_order": 123,
  "currency": "<string>",
  "states": [
    {
      "name": "<string>",
      "type": "<string>",
      "iso": "<string>",
      "iso_2_country": "<string>",
      "iso_2_country_state_code": "<string>",
      "sort_order": 123
    }
  ]
}
'

{
  "data": {
    "id": 123,
    "name": "<string>",
    "iso_2": "<string>",
    "iso_3": "<string>",
    "iso_numeric": "<string>",
    "sort_order": 123,
    "states": [
      {
        "id": 123,
        "name": "<string>",
        "type": "<string>",
        "iso": "<string>",
        "iso_2_country": "<string>",
        "iso_2_country_state_code": "<string>",
        "sort_order": 123,
        "created_at": "<string>",
        "updated_at": "<string>"
      }
    ],
    "currency": "<string>",
    "created_at": "<string>",
    "updated_at": "<string>",
    "region": {
      "id": "<string>",
      "name": "<string>",
      "handle": "<string>",
      "is_default": "<string>"
    }
  }
}