curl --request GET \
  --url https://api.hubapi.com/webhooks-journal/subscriptions/2026-03/filters/{filterId}

{
  "createdAt": 123,
  "filter": {
    "conditions": [
      {
        "filterType": "CRM_OBJECT_PROPERTY",
        "operator": "CONTAINS",
        "property": "<string>",
        "value": "<string>",
        "values": [
          "<string>"
        ]
      }
    ]
  },
  "id": 123
}