Is there an example of super granular API calls for any of the authentication flows?

Regarding a question that is now closed because I took too long to reply (sorry!).

I would like to be able to step through the whole flow by making HTTP requests from a client on my local machine (e.g., cURL, Postman, Insomnia).

OAuth authentication with Postman will work to a point, but I guess what I’m after is the most granular view of the whole flow, with the each API call being explicit. I don’t want to authenticate with another OAuth app to get and use an access token. I want to be able to see each API call happening and the relevant value from the response from each API call being passed to the next one, etc., etc.

Postman with OAuth is another layer of abstraction.