Welcome to /n software 3-D Secure, an extensive development toolkit for implementing any EMV® 3-D Secure program into online shopping carts, websites, or merchant systems. The included Server component allows for easy integration with Visa EMV 3DS, MasterCard Identity Check, American Express Safekey, Discover ProtectBuy, J/Secure, and more.

Included Libraries

The .NET Edition includes several libraries (.dll files) which are supported in different environments. The following libraries are present in the lib directory after installation:

  • lib\nsoftware.IPWorks3DS.dll is designed for use in .NET Framework 4.0 and up, .NET Core 3.0 and up, and .NET 5 and up. This is the default library which maintains a familiar API in line with previous versions of the product.

    Support for asynchronous programming patterns (async/await) is exposed in a separate nsoftware.async.IPWorks3DS namespace. See the Async Functionality page for details.

  • lib\netstandard2.0\nsoftware.IPWorks3DS.dll is designed for use in .NET Standard 2.0 and up. The .NET Standard library provides cross-platform support for legacy projects.

  • lib\net20\nsoftware.IPWorks3DS.dll is designed for use in .NET Framework 2.0 and up. This library targets .NET Framework 2.0 and is maintained for legacy projects.

Included Components

CardValidatorThe CardValidator component is used to verify that a given credit card number is formatted properly, and could be a valid card number. Validating a card before actually submitting a transaction for authorization can reduce the fees that may be associated with invalid or declined transactions.
CertMgrThe CertMgr component is used to create, read, and manage certificates.
ClientThe Client component is designed for use on mobile devices and facilitates EMV® 3-D Secure authentication.
ServerThe Server component provides support for the 3DS Server role as defined in the EMV® 3-D Secure (EMV 3DS) specification.

Additional Information

You will always find the latest information about /n software 3-D Secure at our web site: We offer free, fully-functional 30-day trials for all of our products, and our technical support staff are happy to answer any questions you may have during your evaluation.

Please direct all technical questions to To help support technicians assist you as quickly as possible, please provide an detailed and accurate description of your problem, the results you expected, and the results that you received while using our product. For questions about licensing and pricing, and all other general inquiries, please contact

Thank You!

Thank you for choosing /n software 3-D Secure for your development needs. We realize that you have a choice among development tools, and that by choosing us you are counting on us to be a key component in your business. We work around the clock to provide you with ongoing enhancements, support, and innovative products; and we will always do our best to exceed your expectations!

EMV® 3-D Secure Flow

EMV® 3-D Secure (EMV 3DS) offers two primary experiences for the user: browser and mobile. Each environment has specific requirements during processing, and different flows. /n software 3-D Secure provides functionality for both browser based (Server) and mobile based (3DS SDK) flows in the 3DS Server component. The below sequence diagram exhibits a typical browser-based authentication flow for EMV 3DS.