4D Payments SDK 2016 .NET Edition

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KSN Property

Clear-text Key Serial Number retrieved from a PIN pad.


public string KSN { get; set; }
Public Property KSN As String

Default Value



A 16-byte Key Serial/Sequence Number (KSN) and associated EncryptedPIN are required for all debit Sale and Credit transactions. These values must be retrieved from a certified DUKPT DES pin pad device. The exact length of the Key Serial Number is 16 digits. If the PIN pad returns a 20 digit Key Serial Number and the first four characters are "FFFF", the component will internally strip the "FFFF" prior to passing the Key Serial Number to the Global Transport Gateway.

Debit transactions are only supported for Retail merchants, and only for Card Present transactions. If you set the UserId to an ID associated with a Direct Marketing or E-Commerce merchant account, or otherwise attempt a card-not-present transaction, the component throws an exception.

  component.UserId = "4dpayments_retail";
  component.Password = "Passw0rd";  
  component.Card = new GlobalCard("9999999800002773=05121015432112345678");
  component.TransactionAmount = "25.00";
  component.EncryptedPIN = "623F36B53CC18393";
  component.KSN = "000000008F000021";
  component.CashBack = "5.00";

Copyright (c) 2021 4D Payments Inc. - All rights reserved.
4D Payments SDK 2016 .NET Edition - Version 16.0 [Build 8017]