PLEASE NOTE: you must have the basic knowledge for c# in order for this to work.
step #1: Using Fiddler - Getting API access etc.
Open Fiddler (if you don't already have fiddler then just search up 'Fiddler' on google and download it fam) after, go to the website of your target and log in using an invalid account, and valid. Basically get the request headers, status codes, auth key, etc. After, save that shit on a .txt file or something cuz we need that good stuff later.
step #2 Code your shit
The fun part! So you better start you fuck!
Things I recommend you learning:
HttpRequests:
https://docs.microsoft.com/en-us/dotnet/...mework-4.8
^ Gay asf Use xNet or modded xNet! (it also has a tut and code examples dw):
https://github.com/X-rus/xNet
After you get that shit done, start learning multithreading:
http://www.albahari.com/threading/
That's all the shits you gotta learn!!! After that, you should know what to do.
Also, don't forget to obfuscate your app Pupper
Hope this helped!
EDIT: WORKING ON A BETTER AND MORE INFORMATIVE THREAD ABOUT THIS TOPIC