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

{
  "total_trials": 123,
  "total_registrations": 123,
  "conversion_rate": 123,
  "avg_trial_duration_days": 123,
  "by_provider": [
    {
      "provider": "<string>",
      "count": 123
    }
  ],
  "daily": [
    {
      "date": "<string>",
      "registrations": 123,
      "trials": 123
    }
  ]
}