I am working in a SharePoint 2016 environment with Nintex 2016. I have credentials for an account with full control that are being used in a web service call but get 401 UNAUTHORIZED as the response. What is the minimum permission level required for the credentials to be able to run a web service call? Are there different permission levels required for different web service calls?
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I think it really depends what you're trying to do. For the most part, I would say the user would need to be at least a Site Collection Admin; but, if you're trying to use a web service to say, update user profile service, then that user would need to be added to the web application as an administrator.
As Chadd Sommerfield stated, it does really depend on what you are trying to do, but also where the service lives. If you have a service deployed at your root, can all your users get to it? Have you tried to call the service through Fiddler - Free Web Debugging Proxy - Telerik or Postman | API Development Environment ? This would let you prove out that it is specific (or not specific) to SharePoint.
Hope this helps!