New UI of Dev Center, where find option "Authenticating your service"?
I'm looking for button "Authenticating your service" via this tutorial, and I can't find something similar on Microsoft Dev Center. I want to get a "client secret", where I can find it on Dev Center? 
Solution
Under the app name, go to App management> WNS/MPNS> click Live Service site.
Then you enter the your application registration portal page and can get the Application Secrets as your client secret:
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