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├── src 
│   ├── Api            # API layer
|   |   ├── UseCases      # API business rules in use cases
|   |   |   ├── GetTodos      # Use Case to get all the todo tasks
|   |   |   |   ├── TodoController.cs      # Todo Controller for the Get All
|   |   |   |   ├── GetTodosPresenter.cs      # Presenter 
│   ├── Application         # Application layer
|   |   ├── Boundaries      # Input and output ports helping us to cross boundaries
|   |   ├── Services      # Application services to handle application business logic
|   |   ├── UseCases      # Use cases interactors

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

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

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public class CartService : ICartService
{
    //...
    CheckoutService checkoutDomainService; 
 

    public CartService(... CheckoutService checkoutDomainService ...)
    {
        //... 
        this.checkoutDomainService = checkoutDomainService;

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public class CartController : ApiController
{
    private readonly ICartService _cartService;

    public CartController(ICartService cartService)
    {
        _cartService = cartService;
    }
    
    [HttpPost]

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public class CartController : ApiController
{
    private readonly ICartService _cartService;

    public CartController(ICartService cartService)
    {
        _cartService = cartService;
    }

    [HttpPost]