Easiest way to build the fastest REST API in C# and .NET 7 using CQRS

public class GetOrdersEndpoint : ApiEndpoint<GetOrders.Query, GetOrders.Response>
{
    public override void Configure()
    {
        Get("orders/list");
        AllowAnonymous();
        ResponseCache(60);
    }

    public override async Task HandleAsync(GetOrders.Query request, CancellationToken ct)
        => await SendAsync(await request.ExecuteAsync(ct));
}

public static class GetOrders
{
    public sealed class Query : IQuery<IHandlerResponse<Response>>
    {
    }

    public sealed class Response
    {
        public IReadOnlyCollection<OrderListModel> Orders { get; private set; }

        public Response(IReadOnlyCollection<Domain.Order> orders)
        {
            Orders = orders.Select(OrderListModel.Create).ToList();
        }
    }

    public sealed class Handler : QueryHandler<Query, Response>
    {
        public Handler(IHandlerContext context) : base(context)
        {
        }

        public override async Task<IHandlerResponse<Response>> ExecuteAsync(Query query, CancellationToken ct)
        {
            var orders = await DbContext
                .Orders
                .ToListAsync(ct);

            return Success(new Response(orders));
        }
    }
}

public static class ConfirmAllOrders
{
    public sealed class Command : ICommand
    {
        public string Name { get; set; } = "";
    }

    public sealed class MyValidator : Validator<Command>
    {
        public MyValidator()
        {
            RuleFor(x => x.Name)
                .MinimumLength(5)
                .WithMessage("Order name is too short!");
        }
    }

    public sealed class Handler : Abstractions.CommandHandler<Command>
    {
        public Handler(IHandlerContext context) : base(context)
        {
        }

        public override async Task<IHandlerResponse> ExecuteAsync(Command command, CancellationToken ct)
        {
            var orders = await DbContext
                   .Orders
                   .ToListAsync(ct);

            orders.ForEach(x => x.SetConfrimed());

            await DbContext.SaveChangesAsync(ct);

            return Success();
        }
    }
}

return Success()

return Success(responseObj)

return Error("I felt a great disturbance in the Force, as if millions of voices suddenly cried out in terror and were suddenly silenced. I fear something terrible has happened.")

public class ConfirmAllOrdersFunction : FunctionBase<ConfirmAllOrdersFunction>
{

    public ConfirmAllOrdersFunction(ILogger logger) : base(logger)
    {
    }

    [Function(nameof(ConfirmAllOrdersFunction))]
    public async Task Run([HttpTrigger(AuthorizationLevel.Anonymous, "get", "post")] HttpRequestData req)
    {
        var command = new ConfirmAllOrders.Command();

        await ExecuteAsync<ConfirmAllOrders.Command>(command, req.FunctionContext);
    }
}