curl --request GET \
  --url https://api.hypercore.vn/network/firewalls/{firewall_id} \
  --header 'Authorization: Bearer <token>'

{
  "firewall_group": {
    "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
  }
}