$order_object = Mage::getModel(‘sales/order‘)->load("order_id");
注：order_id 是订单号后面的数字;
$res[‘points_spend‘]=Mage::helper(‘rewards‘)->getPointsString($order_object->getTotalSpentPoints());
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原文地址：http://www.cnblogs.com/echofrank/p/3868283.html
