Securely storing API Keys in C#

Question

I have this scenario:

My .NET Desktop application executes Python scripts to access 3rd party applications.  These applications often require Oauth2 authentification. 

I dont want to expose my API keys in the C# source code. As far as I read there is no safe way to do it.

I expect to have to somehow navigate this workflow around a server of my own.

 

Does anyone have a suggestions how to deal with this situation?