The new Invisible reCAPTCHA field helps protect your Umbraco Forms from bots without having to solve a CAPTCHA. We’re calling it the No CAPTCHA reCAPTCHA experience.
To start using reCAPTCHA, you need to sign up for an API key pair for your site. The key pair consists of a site key and secret key. The site key is used to invoke reCAPTCHA service on your site. The secret key authorizes communication between your application and the reCAPTCHA server to verify the user's response.
For generating needed keys go to https://www.google.com/recaptcha/admin, choose the Invisible reCAPTCHA and then fill in authorized domains or package names. After you accept our terms of service, you can click the Register button to get a new API key pair. Copy keys and paste to /App_Plugins/UmbracoForms/UmbracoForms.config config keys "InvisibleRecaptchaPublicKey" and "InvisibleRecaptchaPrivateKey"
Note: Please make sure that you have installed Umbraco Forms before installing this package.