/// <summary>
/// Makes a deposit of <paramref name="amount"/> to an account with specified <paramref name="iban"/>.
/// </summary>
/// <param name="iban">IBAN of an account to make deposit</param>
/// <param name="amount">deposit amount</param>
/// <returns>new account balance</returns>
/// <exception cref="ArgumentException">deposit amount is lesser than minimal</exception>
public decimal MakeDeposit(string iban, decimal amount)
{
if (string.IsNullOrWhiteSpace(iban))
{
throw new ArgumentException("No IBAN is given.", "IBAN");
}
if (amount < MINDEPOSIT)
{
throw new ArgumentException("Minimum deposit amount is " + MINDEPOSIT.ToString("C"));
}
var account = storage.GetAccount(iban);
account.Balance += amount;
account.BonusPoints += calculator.CalculateDepositPoints(account, amount);
storage.SaveAccount(account);
return(account.Balance);
}