public Billing(IEnumerable <ITariff> tariffs)
{
Data = new BillingUnit();
PhoneManagement = new PhoneManagement(Data);
BalanceOperation = new BalanceOperation(PhoneManagement);
CallManagement = new CallManagement(Data, PhoneManagement);
Tariffs = tariffs;
}
public void PutPhoneOnRecord(object sender, ContractConclusionEvent e)
{
PhoneManagement.PutPhoneOnRecord(e.PhoneNumber, e.Tariff);
}