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Azure Active Directory - Service to Service calls using Client Credentials

The Trusted Application APIs only accept an AAD oauth token issued to an application identity.  In order that your application gets such a token from AAD, you need to either upload your application's credentials ( a certificate ) to AAD, and use that certificate whenever you need an oauth token, or use a client secret.

 

 

More info here:

https://msdn.microsoft.com/en-us/library/azure/dn645543.aspx

https://azure.microsoft.com/en-us/documentation/articles/active-directory-authentication-scenarios

https://github.com/Azure-Samples/active-directory-dotnet-daemon-certificate-credential

https://msdn.microsoft.com/en-us/office/office365/howto/building-service-apps-in-office-365