PaymentStrategy.cs

public abstract class RandomPaymentStrategy : IPaymentStrategy
{
    public ProcessStatus Process(double amount)
    {
        var random = new Random();
        var randomValue = random.Next(0, 2);
        return (ProcessStatus)Math.Min(randomValue, 2);
    }
}

public class PaypalPaymentStrategy : RandomPaymentStrategy { }

public class ApplePayPaymentStrategy : RandomPaymentStrategy { }