OAuth 2.0 authorization code flow is used in the article, which require human interaction to get the credentials.

Please refer: https://learn.microsoft.com/en-us/entra/identity-platform/v2-oauth2-auth-code-flow

If you wish to achieve without human interaction, then client credentials flow to be followed

please refer: https://learn.microsoft.com/en-us/entra/identity-platform/v2-oauth2-client-creds-grant-flow