curl --request GET \
  --url https://demo.onlinebillingform.com/api/v2/country/lists \
  --header 'Authorization: Bearer <token>'

{
  "success": true,
  "countries": {
    "current_page": 1,
    "data": [
      {
        "id": 1,
        "name": "Afghanistan",
        "iso2": "AF",
        "iso3": "AFG",
        "postcode_required": 0
      }
    ],
    "last_page": 17,
    "per_page": 15,
    "total": 253
  }
}