Hi, saeed451, here are some links to some pages that will help you in implementing reCaptcha:
https://supsystic.com/feature/recaptcha-integration/?utm_source=wordpress&utm_medium=recaptcha&utm_campaign=contactform
Contact Form 7 doesn’t support reCaptcha version 2 right now so you can use this plugin instead to implement that if you want version 2: https://ww.wp.xz.cn/plugins/wpcf7-recaptcha/
Otherwise, here is a page that describes what to do for using reCaptcha version 3 with Contact Form 7: https://contactform7.com/recaptcha/
There is:
Contact Form 7’s reCAPTCHA integration module
On your dashboard. In the left hand menu: Contacts > Integration
Enable and configure the required google keys.
Add field to form.
