Core Design Captcha for HikaShop

Please help me to add Core Design Captcha in HikaShop registration form. On developer's page http://www.greatjoomla.com/extensions/plugins/core-design-captcha-plugin.html written - "Easy way to extend the functionality for other Joomla! extensions". For a new extension we need use Core Design Captcha API, which described in the file \plugins\system\cdcaptcha\extension\cdcaptcha_pattern.php and create a new file in \plugins\system\cdcaptcha\extension\ Can you help me to do this?

If you agree to create this addition for HikaShop registration form maybe I can finance it?

I think it's the best captcha, which has a good: protection, ease, design etc

Please give me a more information, how to integrate this captcha through contact page? You mean some HikaShop contact page or standard Joomla contact?

The developer on forum answer me:

You have to add the cdcaptcha_com_hikashop.php file into the "site" subfolder.
Also make sure that this line is part of your newly created class:

public $enabled = 1;

That enables hikashop integration on the fly.