public void UpdateAccountBalance(Account account, decimal amount)
{
if (account == null)
{
throw new ArgumentNullException(nameof(account));
}
repo.SetBalance(account.ID, account.Balance += amount);
repo.AddTransaction(account.ID, amount, account.Balance);
if (account.Balance < 0)
{
reportingService.AccountIsOverdrawn(account.ID);
}
}