Add the power of Google's invisible reCAPTCHA v3 to your store! reCAPTCHA v3 helps you detect abusive traffic on your website without any interaction required by the user. It assigns a score to the user's actions, which can then be used to block users who do not meet the score threshold. This extension is a standard Captcha type OpenCart extension that will show up in Extensions > Captcha, and you can assign it to your pages in System > Settings > Option tab.
Upload and go — modifies no core files.
Set score thresholds individually for the OpenCart pages that suppport captchas (Account Registration, Contact Page, Guest Checkout, Product Reviews, and Returns).
Edit the error message directly in the extension admin panel.
Restrict the captcha to check only guests and/or specific customer groups.
Includes a Testing Mode to view the reCAPTCHA results in the browser error console.
For adding a captcha to account login areas, take a look at: