Domain Service

CheckOutService.cs

public class CheckoutService : IDomainService
{
    IRepository<Purchase> purchaseRepository;

    public CheckoutService(IRepository<Purchase> purchaseRepository)
    {
        this.purchaseRepository = purchaseRepository;
    }


    public Purchase Checkout(Customer customer, Cart cart)
    {
        Purchase purchase = Purchase.Create(cart);

        this.purchaseRepository.Add(purchase);

        cart.Clear();

        DomainEvents.Raise<CustomerCheckedOut>(new CustomerCheckedOut() { Purchase = purchase });

        return purchase;
    }
}