Send API request using UnityWebRequest

I am currently building a game for which I need access to real time data from a server. How do I send an API request to it? And also how similar is it from pulling a JSON from a given URL? I am currently doing that, but the second scenario has no requirement of any auth and I am unable to figuere out how to manage with auth. So can anyone help me with the entire code required for sending an API request?