curl --request GET \
  --url https://api.cal.com/v2/oauth-clients/{clientId}/webhooks \
  --header 'x-cal-secret-key: <x-cal-secret-key>'

{
  "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>"
    }
  ]
}