curl --request GET \
  --url http://localhost:8080/cabinet/subscription/trial

{
  "is_available": true,
  "duration_days": 123,
  "traffic_limit_gb": 123,
  "device_limit": 123,
  "requires_payment": false,
  "price_kopeks": 0,
  "price_rubles": 0,
  "reason_unavailable": "<string>"
}