curl --request GET \
  --url http://localhost:8080/cabinet/admin/campaigns/{campaign_id}/registrations

{
  "registrations": [
    {
      "id": 123,
      "user_id": 123,
      "bonus_type": "<string>",
      "created_at": "2023-11-07T05:31:56Z",
      "telegram_id": 123,
      "username": "<string>",
      "first_name": "<string>",
      "balance_bonus_kopeks": 0,
      "subscription_duration_days": 123,
      "tariff_id": 123,
      "tariff_duration_days": 123,
      "user_balance_kopeks": 0,
      "has_subscription": false,
      "has_paid": false
    }
  ],
  "total": 123,
  "page": 123,
  "per_page": 123
}