Create http post funcitonality for my c# proejct -- 2

I currently have a c# program that is a bot that adds products to cart on 5 websites. I need you to create and integrate http post functionality so that the product can be added to cart without actually loading the page. Finally, the program needs a feature for release days, where it starts adding to cart minutes before the actual release. I also would like the user interface to be modified. I will show you examples after you accept the project. Thank You