curl --request DELETE \
  --url https://api.cal.com/v2/event-types/{eventTypeId} \
  --header 'Authorization: <authorization>' \
  --header 'cal-api-version: <cal-api-version>'

{
  "status": "success",
  "data": {
    "id": 1,
    "lengthInMinutes": 60,
    "title": "Learn the secrets of masterchief!",
    "slug": "<string>"
  }
}