Contact Form 7 Captcha

To use this plugin, you need to sign up for API keys for your site via google site: https://www.google.com/recaptcha/admin
This plugin implements "I'm not a robot" checkbox. When generating keys, choose reCAPTCHA v2 → Checkbox
Add Google CAPTCHA to Contact Form 7.
Protect your Contact Form 7 forms from spam and abuse.
Can be used to protect multiple forms on same page.
Tested with Contact Form 7 version 5.6 and WordPress version 6.0
Configure plugin from Settings ⇒ CF7 Simple Recaptcha.
After configuration, add [cf7sr-simple-recaptcha] to any Contact Form 7 form.
Added CSRF check and escaped attributes in Settings page. Fixed potential Cross-Site Scripting in old web browsers.