The OAuth 2.0 client credentials grant flow permits a web service (confidential client) to use its own credentials, instead of impersonating a user, to authenticate when calling another web service. For a higher level of assurance, the Microsoft identity platform also allows the calling service to authenticate using a [certificate](#second-case-access-token-request-with-a-certificate) or federated credential instead of a shared secret. Because the application's own credentials are being used, these credentials must be kept safe - _never_ publish that credential in your source code, embed it in web pages, or use it in a widely distributed native application.
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