curl --request POST \
  --url https://api.hubapi.com/webhooks/v3/{appId}/subscriptions \
  --header 'Content-Type: application/json' \
  --data '{
  "active": true,
  "eventType": "contact.propertyChange",
  "propertyName": "email"
}'

{
  "createdAt": "2023-11-07T05:31:56Z",
  "objectTypeId": "<string>",
  "propertyName": "<string>",
  "active": true,
  "eventType": "contact.propertyChange",
  "id": "<string>",
  "updatedAt": "2023-11-07T05:31:56Z"
}