curl --request GET \
  --url https://api.open.cx/resource-usage/{resource_type} \
  --header 'Authorization: Bearer <token>'

{
  "items": [
    {
      "resource_id": "<string>",
      "session_count": 123,
      "applied_sessions": 123,
      "applied_replies": 123,
      "available_sessions": 123,
      "available_replies": 123,
      "handoff_count": 123,
      "first_used_at": "<string>",
      "last_used_at": "<string>"
    }
  ],
  "next": "<string>"
}