curl --request GET \
  --url https://api.wavix.com/v1/buy/countries/{country}/regions \
  --header 'Authorization: Bearer <token>'

{
  "regions": [
    {
      "id": 13,
      "name": "Alabama"
    },
    {
      "id": 15,
      "name": "Arizona"
    },
    {
      "id": 16,
      "name": "Arkansas"
    },
    {
      "id": 17,
      "name": "California"
    }
  ]
}