The article below concerns Nintex Workflow Cloud. Nintex Workflow Cloud is a cloud-based platform where you can design workflows to automate simple to complex processes using drag-and-drop interactions without writing any code. You can build digital forms, integrate web services, and connect to third-party applications to create a seamless experience for your end users throughout the workflow.
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https://help.nintex.com/en-US/nintex2019/current/#sp2019/Workflow/Designer/UsingExternalStart.htm
https://help.nintex.com/en-US/nintex2019/current/#sp2019/Workflow/NWCStart/StartWorkflowNWC-actionref.htm