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Loyalty Points Card for Virtuemart extension (not free), which offers a special loyalty program for buyers of your website built on a component Virtuemart.
Loyalty Points Card for Virtuemart

Reward their own customers with rewards for purchases made! The plugin is not a payment system, and a special set of rules and points. Installs through the standard extension Manager.
To get started, you’ll need a third party component of social activity like AltaUserPoints (free solution), Jomsocial or EasySocial. During the installation process for these 3 social plugins you will have recorded a few rules to confirm the bonuses. Thus a registered site visitors can get useful points which they can exchange for products in your store.
Install through normal Joomla installer this component and find it in the plugin Manager
Open the settings:
Points system: Points AltaUserPoints or Jomsocial or EasySocial Points. Whatever of these third-party extensions you use, make sure that one of them is installed on your system. Please note – AltaUserPoints is a free solution, other components of pay.
Ratio: How many points to set the store’s currency. For example if you bet 100, 1 point will cost 0.01€.
Percentage: set the percentage of the value of the goods, which will be added as bonuses to the buyer.