curl --request POST \
  --url 'https://api.flashcat.cloud/calendar/event/list?app_key=' \
  --header 'Content-Type: application/json' \
  --data '
{
  "cal_id": "cal.QiNvtdKs4Wj52kZhT3LafM",
  "year": 2024,
  "month": 5
}
'

{
  "request_id": "01HK8XQE3Z7JM2NTFQ5YJ8P9R4",
  "data": {
    "items": [
      {
        "account_id": 2451002751131,
        "creator_id": 2476444212131,
        "cal_id": "cal.QiNvtdKs4Wj52kZhT3LafM",
        "event_id": "cale.KyG9XWTCU5CucbwukEVBQ4",
        "summary": "Test Holiday",
        "description": "A test holiday event",
        "start_at": "2026-05-01",
        "end_at": "2026-05-02",
        "is_off": true,
        "created_at": 1775972034,
        "updated_at": 1775972034
      },
      {
        "account_id": 2451002751131,
        "creator_id": 2451002751131,
        "cal_id": "cal.QiNvtdKs4Wj52kZhT3LafM",
        "event_id": "non_work.20260502",
        "summary": "non-working day (Saturday)",
        "description": "",
        "start_at": "2026-05-02",
        "end_at": "2026-05-03",
        "is_off": true,
        "created_at": 0,
        "updated_at": 0
      }
    ],
    "total": 11
  }
}