curl --request PUT \
  --url https://api.reply.io/v3/holiday-calendars/{id} \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "name": "Company Holidays 2026 (Updated)",
  "repeatEveryYear": true,
  "holidays": [
    {
      "startDate": "2026-07-04",
      "endDate": "2026-07-04",
      "name": "Independence Day"
    }
  ]
}
'

{
  "id": 3,
  "name": "US Holidays",
  "calendarType": "custom",
  "countryCode": "US",
  "repeatEveryYear": true,
  "holidays": [
    {
      "id": 100,
      "startDate": "2026-12-25",
      "endDate": "2026-12-25",
      "name": "Christmas Day"
    }
  ]
}