Q:

How to add the functionality of a gift certificate in VirtueMart?

I am creating an online shop using VirtueMart. Now I want to add facility of a gift card as we have in Magento and OsCommerce. So is there any plugin available in VirtueMart or do I have to customize VirtueMart ?

A:

VM does not do Magento/OSC style gift certificates without an extension. It does support simple coupons, but they are pretty limited in how they work. Your best bet is to use AwoCoupon, it's free.
http://extensions.joomla.org/extensions/extension-specific/virtuemart-extensions/virtuemart-coupons/11629

