using System;

​

public class Program

{

    public static void Main()

    {

        TrustlyLinkedPaymentInstrument existingTrustlyLinkedPaymentInstrument = null;

        var trustlyPaymentInstrumentLinkingDetails = new TrustlyLinkedPaymentInstrument

        {

            IsSsnPassed = true

        };

        var isSsnPassedV1 = existingTrustlyLinkedPaymentInstrument?.IsSsnPassed ?? trustlyPaymentInstrumentLinkingDetails.IsSsnPassed;

        var isSsnPassedV2 = existingTrustlyLinkedPaymentInstrument?.IsSsnPassed ?? false || trustlyPaymentInstrumentLinkingDetails.IsSsnPassed;

        Console.WriteLine(isSsnPassedV1.ToString());

        Console.WriteLine(isSsnPassedV2.ToString());

    }

​

    private class TrustlyLinkedPaymentInstrument

    {

        public bool IsSsnPassed { get; set; }

    }

}