curl --request POST \
  --url https://api.hubapi.com/webhooks-journal/subscriptions/2026-03/filters \
  --header 'Content-Type: application/json' \
  --data '
{
  "filter": {
    "conditions": [
      {
        "filterType": "CRM_OBJECT_PROPERTY",
        "operator": "CONTAINS",
        "property": "<string>",
        "value": "<string>",
        "values": [
          "<string>"
        ]
      }
    ]
  },
  "subscriptionId": 123
}
'

{
  "filterId": 123
}