curl --request GET \
  --url https://sandbox.prezio.eu/api/countries/ \
  --header 'Authorization: <api-key>'

{
  "count": 12,
  "next": "https://api.prezio.com/api/countries/?page=2",
  "previous": "https://api.prezio.com/api/countries/?page=1",
  "results": [
    {
      "id": "DK",
      "name": "Denmark",
      "code": "DK",
      "available_interval_minutes": [
        15,
        60
      ]
    }
  ]
}