curl --request GET \
  --url https://api.example.com/cabinet/admin/stats/sales/subscriptions \
  --header 'Authorization: Bearer <token>'

{
  "total_sales": 123,
  "total_revenue_kopeks": 123,
  "avg_order_kopeks": 123,
  "top_tariff_name": "<string>",
  "by_tariff": [
    {
      "tariff_id": 123,
      "tariff_name": "<string>",
      "count": 123
    }
  ],
  "by_period": [
    {
      "period_days": 123,
      "count": 123
    }
  ],
  "daily": [
    {
      "date": "<string>",
      "count": 123,
      "revenue_kopeks": 123
    }
  ],
  "daily_by_tariff": [
    {
      "date": "<string>",
      "tariff_name": "<string>",
      "count": 123
    }
  ]
}