Procedural.cs

public class Procedural
{
    private readonly Database _db;
    private readonly PaymentGateway _paymentGateway;
    private readonly Emailer _email;

    public Procedural(Database db, PaymentGateway paymentGateway, Emailer email)
    {
        _db = db;
        _paymentGateway = paymentGateway;
        _email = email;
    }

    public async Task PlaceOrder(Order order, CreditCard creditCard)
    {
        // Add the Order to DB
        _db.Add(order);

        // Process Payment
        try
        {
            await _paymentGateway.Process(creditCard);
        }
        catch (TaskCanceledException)
        {
            order.Status = OrderStatus.Cancelled;
            _db.Save(order);
            return;
        }

        // Email Confirmation
        try
        {
            await _email.SendConfirmation(order);
        }
        catch (Exception)
        {
            // Swallow/Log because we don't the whole thing to blow up...
        }
    }
}