Nintex Gateway Xtensions
With Nintex Gateway you can create Xtensions to integrate on-premises applications with Nintex Workflow. Nintex Gateway acts as middleware to authenticate the communication between Nintex Workflow and your on-premises application. Authentication is performed via Active Directory using basic username and password or via Managed authentication using API keys generated by Nintex Gateway.
For more information on creating on-premises Xtensions with Nintex Gateway, see Integrate on-premises applications via Nintex Gateway.
Looking for an example? See Use Nintex Gateway to integrate with SAP Theobald using yunIO.