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A web API that calls web APIs: App registration

A web API that calls downstream web APIs has the same registration as a protected web API. Follow the instructions in Protected web API: App registration.

Because the web app now calls web APIs, it becomes a confidential client application. That's why extra registration information is required: the app needs to share secrets (client credentials) with the Microsoft identity platform.

Add a client secret or certificate

As with any confidential client application, you need to add a secret or certificate to act as that application's credentials so it can authenticate as itself, without user interaction.

You can add credentials to your client app's registration by using the Azure portal or by using a command-line tool like PowerShell.

Add client credentials by using the Azure portal

To add credentials to your confidential client application's app registration, follow the steps in Quickstart: Register an application with the Microsoft identity platform for the type of credential you want to add:

Add client credentials by using PowerShell

Alternatively, you can add credentials when you register your application with the Microsoft identity platform by using PowerShell.

The active-directory-dotnetcore-daemon-v2 code sample on GitHub shows how to add an application secret or certificate when registering an application:

API permissions

Web apps call APIs on behalf of users for whom the bearer token was received. The web apps need to request delegated permissions. For more information, see Add permissions to access your web API.

Next steps

Move on to the next article in this scenario, App Code configuration.