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

{
  "campaign_id": 123,
  "campaign_name": "<string>",
  "period_comparison": {
    "current": {
      "days": 123,
      "referrals_count": 0,
      "earnings_kopeks": 0
    },
    "previous": {
      "days": 123,
      "referrals_count": 0,
      "earnings_kopeks": 0
    },
    "referrals_change": {
      "absolute": 0,
      "percent": 0,
      "trend": "stable"
    },
    "earnings_change": {
      "absolute": 0,
      "percent": 0,
      "trend": "stable"
    }
  },
  "registrations_count": 0,
  "referrals_count": 0,
  "earnings_kopeks": 0,
  "conversion_rate": 0,
  "earnings_today": 0,
  "earnings_week": 0,
  "earnings_month": 0,
  "daily_stats": [],
  "top_referrals": []
}