Then either throw it away and learn what you’re actually doing, or else ask ChatGPT.
Hint: nobody here knows what ChatGPT is doing either. We’re all working from the official Unity3D documentation and doing Software Engineering to arrive at an engineered solution to a problem.
Don’t think of it as an “all at once” problem. Get each piece working one step at a time.
Some more reading:
Networking, UnityWebRequest, WWW, Postman, curl, WebAPI, etc:
https://discussions.unity.com/t/831681/2
https://discussions.unity.com/t/837672/2
And setting up a proxy can be very helpful too, in order to compare traffic:
https://support.unity.com/hc/en-us/articles/115002917683-Using-Charles-Proxy-with-Unity