using System;

using System.Collections.Generic;

using System.Linq;

​

​

public class OrderProcessor

{

    public void ProcessOrder(Order order)

    {

        OrderRepository.AddOrder(order);

    }

}

​

​

public class CreditCardPayment 

{

    public void Pay(decimal amount)

    {

        Console.WriteLine($"Processing credit card payment of ${amount}.");

    }

}

​

public class PayPalPayment 

{

    public void Pay(decimal amount)

    {

        Console.WriteLine($"Processing PayPal payment of ${amount}.");

    }

}

​

public class Order

{

    public int OrderId { get; set; }

    public string PaymentMethod { get; set; }

    public decimal Amount { get; set; }

}

​

​

public static class OrderRepository

{

    private static readonly List<Order> _orders = new List<Order>();

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    public static void AddOrder(Order order)

    {

        _orders.Add(order);

    }

​

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    public static void DisplayOrdersByPaymentMethod(string method)

    {

    }

​

    public static void DisplayTotalAmountByPaymentMethod()

    {

    }

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    public static void DisplayOrdersAboveAmount(decimal threshold)

    {

    }

}

​

​

class Program

{

    static void Main(string[] args)

    {

        var creditCardPayment = new CreditCardPayment();

        var payPalPayment = new PayPalPayment();

​

        var orderProcessor = new OrderProcessor();

        orderProcessor.ProcessOrder(new Order { OrderId = 1, PaymentMethod = "CreditCard", Amount = 150 });

​

        orderProcessor = new OrderProcessor();

        orderProcessor.ProcessOrder(new Order { OrderId = 2, PaymentMethod = "PayPal", Amount = 75 });

​

        orderProcessor = new OrderProcessor();

        orderProcessor.ProcessOrder(new Order { OrderId = 3, PaymentMethod = "CreditCard", Amount = 300 });

    }

}