Some custom implementations may contain additional "data-s" parameter in ReCaptcha2 div, which is in fact a one-time token and must be grabbed every time you want to solve a ReCaptcha2. <div class="g-recaptcha" data-sitekey="some sitekey" data-s="THIS_ONE"></div>
Browser's User-Agent which is used in emulation. It is required that you use a signature of a modern browser, otherwise Google will ask you to "update your browser".
Additional cookies which we must use during interaction with target page or Google.