curl --request GET \
  --url https://api.cloud.onidel.com/network/firewalls \
  --header 'Authorization: Bearer <token>'

{
  "firewall_groups": [
    {
      "id": "e4d3c2b1-5678-9abc-def0-fedcba098765",
      "description": "Production Firewall",
      "created": "2024-01-15T10:30:00Z",
      "updated": "2024-01-20T14:45:00Z",
      "instance_count": 3,
      "rule_count": 5
    }
  ]
}