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Signing service allows you to use the user's existing credentials with other providers in your application. You often see the following when logging in to your account with a service:
You will utilize what is called the OAuth2 authorization flow. OAuth2 is an authorization mechanism. It allows a web application such as yours to gain limited access to user accounts in various HTTP services (Microsoft, Google, etc). So strictly speaking, OAuth2 is more about authorization than authentication.
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