reCAPTCHA is a free service that uses an advanced risk analysis engine to protect your app from spam and other abusive actions. If the service suspects that the user interacting with your app might be a bot instead of a human, it serves a CAPTCHA that a human must solve before your app can continue executing.
How to use it
Step 1. Go to Google reCaptcha website.
Step 2. Fill all the required fields note you need to select reCAPTCHA Android if you are selecting reCAPTCHA type V2 as shown in the below image.
Step 3. Now you also need to define your package name in the packages field you can add multiple packages.
Step 4. Once you fill all fields you get your API. paste in text block as shown in the below image.
NOTE: 1. Before testing the extension you need to know that If reCAPTCHA is confident that this is a real user on a real device it will not show visual/audio captcha, Otherwise, it will provide a visual/audio captcha. More Information
NOTE: 2. This extension is compatible only with Kodular and it must be used with Google Play Games component, otherwise the app will crash.