Invisible CAPTCHA | Full Stack Development

Hi, I have a contact form: [login to view URL] I want to upgrade the existing ReCaptcha to the new Invisible version. I have uploaded the existing files so that you can take a look at them. Please watch out that the "Senden" Button is linked to some Ajax conditions. Please look also at the [login to view URL], because it is optimized for the old ReCaptcha version. It has to be modified to work with the new Invisible ReCaptcha I'll provide the Site Key and Secret Key to the winner of the project