curl --request PATCH \
  --url https://api-m.sandbox.paypal.com/v1/notifications/webhooks/{webhook_id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
[
  {
    "op": "add",
    "path": "<string>",
    "value": "<unknown>",
    "from": "<string>"
  }
]
'

{
  "url": "<string>",
  "event_types": [
    {
      "name": "<string>",
      "description": "<string>",
      "status": "<string>",
      "resource_versions": [
        "<string>"
      ]
    }
  ],
  "id": "<string>",
  "links": [
    {
      "href": "<string>",
      "rel": "<string>",
      "method": "GET"
    }
  ]
}