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When COD is selected then how to disable shipping & handling charges?
I am using magento 1.6.2 and for Cash On Delivery(COD) i am using free extension http://www.magentocommerce.com/magento-connect/cashondelivery.html. I have installed in my project Its working Properly. But When user is selecting COD option in Payment method then it should not add shipping & handling charges(i.e) removing Shipping fee based on COD.