Saga code from ADSD course in Israel

gistfile1.cs

namespace Billing
{
    public class RefundPolicyData : IContainSagaData
    {
        public Guid Id { get; set; }
        public string Originator { get; set; }
        public string OriginalMessageId { get; set; }

        public Guid OrderId { get; set; }
        public DateTime TimeOfOrder { get; set; }
    }

    public class RefundPolicy : Saga<RefundPolicyData>,
        IAmStartedByMessages<OrderAccepted>,
        IHandleMessages<ProductsReturned>
    {
        public TimeSpan FirstWindow { get; set; }
        public TimeSpan SecondWindow { get; set; }

        public void Handle(OrderAccepted message)
        {
            Data.TimeOfOrder = message.TimeOfOrder;
        }

        public void Handle(ProductsReturned message)
        {
            
            Bus.Send<IssueRefund>(m => { m.Percent = 100; m.OrderId = message.OrderId; });
            MarkAsComplete();
        }


        public override void ConfigureHowToFindSaga()
        {
            ConfigureMapping<ProductsReturned>(s => s.OrderId, m => m.OrderId);
        }
    }

    public class IssueRefund : ICommand
    {
        public Guid OrderId { get; set; }
        public float Percent { get; set; }
    }
    public class ProductsShipped : IEvent
    {
        public Guid OrderId { get; set; }
    }

    public class OrderCancelled : IEvent
    {
        public Guid OrderId { get; set; }
    }

    public class ProductsReturned : IEvent
    {
        public Guid OrderId { get; set; }
    }

    public class OrderAccepted : IEvent
    {
        public Guid OrderId { get; set; }
        public DateTime TimeOfOrder { get; set; }
        public float Total { get; set; }
        public Guid CustomerId {get; set; }
    }

    public class AccumulatorData : IContainSagaData
    {
        public Guid Id { get; set; }
        public string Originator { get; set; }
        public string OriginalMessageId { get; set; }

        public float SevenDayTotal { get; set; }
        [Unique]
        public Guid CustomerId { get; set; }
    }

    public class AccumulatorSaga : Saga<AccumulatorData>,
        IAmStartedByMessages<OrderAccepted>,
        IHandleTimeouts<OrderAccepted>
    {
        public void Handle(OrderAccepted message)
        {
            if (Data.SevenDayTotal > 500) ;

            Data.CustomerId = message.CustomerId;
            Data.SevenDayTotal += message.Total;

            RequestUtcTimeout(TimeSpan.FromDays(7), message);
        }

        public void Timeout(OrderAccepted state)
        {
            Data.SevenDayTotal -= state.Total;
        }

        public override void ConfigureHowToFindSaga()
        {
            ConfigureMapping<OrderAccepted>(s => s.CustomerId, m => m.CustomerId);
        }
    }


    public class SagaCOnfiguration : INeedInitialization
    {
        public void Init()
        {
            Configure.Instance.Configurer
                .ConfigureProperty<RefundPolicy>(s => s.FirstWindow, TimeSpan.FromDays(30))
                .ConfigureProperty<RefundPolicy>(s => s.SecondWindow, TimeSpan.FromDays(60));

        }
    }
}