Expert in Selenium for C# .net and .Net Web cliente / HTTP requests / web client and Fiddler

I have an application that Is missing some pieces in the web requests (cookies/headers/others) because I am getting 403 error. Previous requests are Made using Selenium Driver. If I continue using Selenium it works. I need to Switch the flow to use web requests using web client HTTP requests in C#. I play by the hour and need no More than 2 or 3 Hours. Need work done ASAP starting after 2 or 3 Hours after this publishing. Work must be done in my computer using AnyDesk or similar. I Will award and pay first hour. If More requiered, Will be created More Milestones for additional 1 or 2 hours, only ir success Is guaranteed. If succeed in first hour, I can tip for additional unused Time.