This is a simple implementation of hCaptcha for OpenCart 3
It has been tested on OpenCart 3.0.3.3
Copy all the contents in the upload folder to your opencart root folder.
Afterwards go to Extensions > Extensions, select Captcha from the dropdown menu, install hCaptcha and configure it.
Only thing left is to enable hCaptcha in the OpenCart settings. System > Settings, select the store and go to Option, scroll down to Captcha and select hCaptcha and the pages you want to activate it on.