It’s possible to install a module to use Google reCaptcha service (reCAPTCHA ) which is supplied in the Business and Enterprise installation package.
The related API call that can be used to validate captcha token:
Application API
validateCaptcha
When the Captcha module is enabled, the above API call automatically use the module rather than the configured Google reCAPTCHA server to validate token.
Configure Google reCAPTCHA service
In order to use Google reCAPTCHA, you must register for the service and get an API key. Once you have the key you can use it to configure the module as shown above.
The Captcha module is an example which can be used in order to create a module for any other captcha service. It inherits a lot of useful reusable functionality from BaseMailModule.java which you can find under the KonaKart/custom/modules/src/com/konakart/bl/modules/others directory. Please contact sales@konakart.com if you’d like a quote for the development of a module for any specific external service that you'd like to use.