Use API service to resolve CloudFlare's Turnstile captcha in C#

Job ID: 36336567

Budget: $250 – $750 USD

I am a software developer and I developed a simple web scraping software using C#'s HttpClient and HttpWebRequest classes.
I used to login the target web site normally, but since last week it turned out with CloudFlare's Turnstile captcha solution.
So, my software cannot login the target web site anymore.
And I found these 2 captcha api on a web site below:
https://2captcha.com/2captcha-api#turnstile

But I am stuck with step 5.
My target web site does not seem to send cf-turnstile-response value or g-recaptcha-response value to target web site.
If anyone could solve this out with 2 captcha api, I can finish my project.