curl --request POST \
  --url https://api.cal.com/v2/oauth-clients/{clientId}/webhooks \
  --header 'Content-Type: application/json' \
  --header 'x-cal-secret-key: <x-cal-secret-key>' \
  --data '{
  "payloadTemplate": "{\"content\":\"A new event has been scheduled\",\"type\":\"{{type}}\",\"name\":\"{{title}}\",\"organizer\":\"{{organizer.name}}\",\"booker\":\"{{attendees.0.name}}\"}",
  "active": true,
  "subscriberUrl": "<string>",
  "triggers": [
    "BOOKING_CREATED",
    "BOOKING_RESCHEDULED",
    "BOOKING_CANCELLED",
    "BOOKING_CONFIRMED",
    "BOOKING_REJECTED",
    "BOOKING_COMPLETED",
    "BOOKING_NO_SHOW",
    "BOOKING_REOPENED"
  ],
  "secret": "<string>"
}'

{
  "status": "success",
  "data": {
    "payloadTemplate": "{\"content\":\"A new event has been scheduled\",\"type\":\"{{type}}\",\"name\":\"{{title}}\",\"organizer\":\"{{organizer.name}}\",\"booker\":\"{{attendees.0.name}}\"}",
    "oAuthClientId": "<string>",
    "id": 123,
    "triggers": [
      {}
    ],
    "subscriberUrl": "<string>",
    "active": true,
    "secret": "<string>"
  }
}