curl --request POST \
  --url https://prod.featherhq.com/api/v1/calendars/{calendarId}/schedules \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "timezone": "<string>",
  "name": "Default",
  "isDefault": false,
  "availability": []
}
'

{
  "id": "<string>",
  "calendarId": "<string>",
  "name": "<string>",
  "timezone": "<string>",
  "isDefault": true,
  "createdAt": "<string>",
  "updatedAt": "<string>",
  "availabilities": [
    {
      "id": "<string>",
      "days": [
        3
      ],
      "startTime": 720,
      "endTime": 720,
      "date": "<string>"
    }
  ]
}