Register application for user authentication

For testing, you can register an application that supports user authentication using device code flow.

Open a browser and navigate to the Microsoft Entra admin center and login using a Work or School Account.
Select Applications in the left-hand navigation bar, then select App registrations.
Select New registration. Enter a name for your application, for example, Budget Tracker Testing.
Set Supported account types to Accounts in this organizational directory only.
Leave Redirect URI empty.
Select Register. On the application's Overview page, copy the value of the Application (client) ID and Directory (tenant) ID.
Select Authentication under Manage. Locate the Advanced settings section and change the Allow public client flows toggle to Yes, then choose Save.

Add registration details to test file

Open BudgetTracker.http in Visual Studio Code.
Replace all instances of API_CLIENT_ID with the Application (client) ID you generated in the previous steps.
Replace all instances of TENANT_ID with the Application (client) ID you generated in the previous steps.
If you do not have the REST Client Visual Studio Code extension installed, install it before proceeding to the next step.
Locate the GetBudgets request in BudgetTracker.http. Select the Send Request link to send this request in order to initialize authentication.
In the dialog, select Sign in to open your browser to the sign in page.
At the Enter code prompt, paste the code and select Next. Follow the prompts until you see a success message.
Return to Visual Studio Code and select Done in the dialog.
The API response is displayed in a new tab.

After you've initialized authentication with the GetBudgets request, you can test the other requests in the file.