This post helps you to set up Google Captcha (V3) to your WordPress Contact Form 7.
1 Contact Form 7 has already a feature included for captcha. You only need to register your site with Google and get the Site Key and Secret Key.
How do I get API Keys (Site Key and Secret Key)?
Please go to the official site of Google Captcha which is as below and click on “Admin Console”
https://www.google.com/recaptcha/intro/v3.html