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

{
  "conversations": [
    {
      "session_id": "<string>",
      "ticket_number": 123,
      "last_message": "<string>",
      "reply_count": 123,
      "first_used_at": "<string>",
      "last_used_at": "<string>"
    }
  ],
  "total_sessions": 123
}