When designing a page in magento and you want to display the Reward Dollars for a customer by using their id number here is how:
$customer = Mage::getModel('customer/customer')->load($customer_id); $balance = Mage::getModel('enterprise_reward/reward') ->setCustomer($customer) ->setWebsiteId(Mage::app()->getWebsite()->getId()) ->loadByCustomer() ->getCurrencyAmount();