Remote authenticate external user for shared sharepoint site via Web API

Copper Contributor

I want to remote-authenticate external users with whom I have shared my SharePoint site. 


I am trying to authenticate user ( from .net Web API. I am able to surf the shared sharepoint site from this user, but when I try to authenticate via code, then it is not being authenticated, also I am able to authenticate organizational users with the same code.


So, want to know whether this is feasible or not?


And if it is, then which mechanism to be used for authentication.

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