Step 1: Log into your Google account, then go to https://www.google.com/recaptcha
Step 2: Click on ” Get reCaptcha” button at the upper right hand corner of the screen.
Step 3: Register for Website
Register the Website in which you need to integrate Google reCaptcha API.
Step 4: Once the registration is done, the Site Key (Public Key) and Secret Key (Private Key) will be shown as follows: