title: Get the sitekey reCaptcha of a site
body: <p>I'm creating a node.js script with puppeteer to create an email account but I'm having trouble with the reCaptcha validation.
  I found out a plugin within puppeter-extra that solves reCaptchas automatically. (<a href="https://www.npmjs.com/package/puppeteer-extra-plugin-recaptcha" rel="nofollow noreferrer">https://www.npmjs.com/package/puppeteer-extra-plugin-recaptcha</a>)</p>
  
  <p>And with the following website: <a href="https://www.google.com/recaptcha/api2/demo" rel="nofollow noreferrer">https://www.google.com/recaptcha/api2/demo</a> I can get the script to validate my reCaptcha and go forward.</p>
  
  <p>But in the <a href="https://mail.protonmail.com/create/new?language=en" rel="nofollow noreferrer">https://mail.protonmail.com/create/new?language=en</a> after inserting the email + password and click the button to continue, a reCaptcha appears but the script doesn't solve it. In order to solve a reCaptcha a sitekey variable is needed and in the source code of the website, I can't find it.</p>
  
  <p>If I inspect the element I actually can get the source of the captcha <a href="https://mail.protonmail.com/api/users/captcha/signup" rel="nofollow noreferrer">https://mail.protonmail.com/api/users/captcha/signup</a> and find a var named "publickey" which is very similar to the 'sendKey' in the website I got the script to work.</p>
  
  <p>I'm a bit stuck and would like to know how I can implement this.</p>