curl --request GET \
  --url 'https://{domain}/api/v2/network/reports/statistics-tree?api-key='

{
  "message": "<string>",
  "rows": [
    {
      "traffic_source": {
        "id": 123,
        "value": "<string>"
      },
      "traffic_approach": {
        "id": 123,
        "value": "<string>"
      }
    }
  ],
  "totals": {}
}