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 or mobile application.
The secret key authorizes communication between your application backend and the reCAPTCHA server to verify the user’s response.
The secret key needs to be kept safe for security purposes.
To create the API Key click the following link: https://www.google.com/recaptcha/admin/create.
At the reCAPTCHA type, select reCAPTCHA v2 -> “I’m not a robot” and then fill in authorized domains or package names.
After you accept terms of service, you can click SUBMIT button to get new API key pair.