curl --request GET \
  --url https://demo.onlinebillingform.com/api/v1/county/lists-by-country \
  --header 'token: <token>'

{
  "success": true,
  "counties": [
    {
      "id": 122,
      "country_id": 5,
      "name": "Andorra la Vella",
      "code": "ALV"
    },
    {
      "id": 123,
      "country_id": 5,
      "name": "Canillo",
      "code": "CAN"
    },
    {
      "id": 124,
      "country_id": 5,
      "name": "Encamp",
      "code": "ENC"
    },
    {
      "id": 125,
      "country_id": 5,
      "name": "Escaldes-Engordany",
      "code": "ESE"
    },
    {
      "id": 126,
      "country_id": 5,
      "name": "La Massana",
      "code": "LMA"
    },
    {
      "id": 127,
      "country_id": 5,
      "name": "Ordino",
      "code": "ORD"
    },
    {
      "id": 128,
      "country_id": 5,
      "name": "Sant Julia de Loria",
      "code": "SJL"
    }
  ]
}