How to properly obtain and store Azurea access tokens following best practices?

[ProximaB]

I’m trying to figure out the best, maintainable way to obtain and store an Azure AD access token so that developers can request it once and reuse it across multiple .http files or requests.
We’re using the standard v2.0 token endpoint:
POST https://login.microsoftonline.com/{{tenantId}}/oauth2/v2.0/token

What is the recommended approach for:
requesting the token once,
securely storing/caching it (e.g., environment variables, scripts, httpyac hooks), and
reusing it across different requests without manually copying it every time?

Looking for best practices for development scenarios.
Thanks!