curl --request POST \
  --url https://your-instance.example.com/api/filters.create \
  --header 'Content-Type: application/json' \
  --data '
{
  "workspace_id": "<string>",
  "name": "<string>",
  "conditions": [
    {
      "field": "utm_source",
      "operator": "equals",
      "value": "<string>"
    }
  ],
  "operations": [
    {
      "dimension": "channel",
      "action": "set_value",
      "value": "<string>"
    }
  ],
  "priority": 500,
  "tags": [
    "<string>"
  ],
  "enabled": true
}
'