curl --request GET \
  --url https://api.example.com/cabinet/admin/referral-network/campaign/{campaign_id} \
  --header 'Authorization: Bearer <token>'

{
  "id": 123,
  "name": "<string>",
  "start_parameter": "<string>",
  "is_active": true,
  "direct_users": 123,
  "total_network_users": 123,
  "total_revenue_kopeks": 123,
  "conversion_rate": 123,
  "avg_check_kopeks": 123,
  "top_referrers": [
    {
      "user_id": 123,
      "username": "<string>",
      "referral_count": 123
    }
  ]
}