Strategy

public interface Strategy
{
    void Execute();
}

public class ConcreteStrategyA : Strategy
{
    public void Execute()
    {
        Console.WriteLine("Executing strategy A");
    }
}

public class ConcreteStrategyB : Strategy
{
    public void Execute()
    {
        Console.WriteLine("Executing strategy B");
    }
}

public class ConcreteStrategyC : Strategy
{
    public void Execute()
    {
        Console.WriteLine("Executing strategy C");
    }
}

public interface IPaymentStrategy
{
    void Pay(decimal amount);
}

public class CreditCardStrategy(
    string name,
    string cardNumber,
    string cvv,
    string dateOfExpiry) : IPaymentStrategy
{
    private string _name = name;
    private string _cardNumber = cardNumber;
    private string _cvv = cvv;
    private string _dateOfExpiry = dateOfExpiry;

    public void Pay(decimal amount)
    {
        Console.WriteLine($"Paid {amount} using credit card");
    }
}

public class BankTransferStrategy(string bankName, string accountNumber) : IPaymentStrategy
{
    private readonly string _bankName = bankName;
    private readonly string _accountNumber = accountNumber;

    public void Pay(decimal amount)
    {
        Console.WriteLine($"Paid {amount} using Bank Transfer");
    }
}

public class PayPalStrategy(string email, string password) : IPaymentStrategy
{
    private string _email = email;
    private string _password = password;

    public void Pay(decimal amount)
    {
        Console.WriteLine($"Paid {amount} using PayPal");
    }
}