curl --request GET \
  --url https://api.utage-system.com/v1/accounts/{account_id}/scenarios/{scenario_id}/messages \
  --header 'Authorization: Bearer <token>'

{
  "data": [
    {
      "id": "<string>",
      "title": "<string>",
      "mail": {
        "subject": "<string>",
        "from_name": "<string>",
        "from_mail": "<string>"
      },
      "line": {
        "messages_count": 123
      },
      "created_at": "<string>",
      "updated_at": "<string>"
    }
  ],
  "meta": {
    "current_page": 123,
    "per_page": 123,
    "total": 123
  }
}