curl --request GET \
  --url http://localhost:8080/promo-codes

{
  "items": [
    {
      "id": 123,
      "code": "<string>",
      "type": "balance",
      "balance_bonus_kopeks": 123,
      "balance_bonus_rubles": 123,
      "subscription_days": 123,
      "max_uses": 123,
      "current_uses": 123,
      "uses_left": 123,
      "is_active": true,
      "is_valid": true,
      "valid_from": "2023-11-07T05:31:56Z",
      "created_at": "2023-11-07T05:31:56Z",
      "updated_at": "2023-11-07T05:31:56Z",
      "valid_until": "2023-11-07T05:31:56Z",
      "created_by": 123
    }
  ],
  "total": 123,
  "limit": 123,
  "offset": 123
}