Add custom attribute to Sales Order in Magento

1> Step 1 require_once('app/Mage.php'); Mage::app()->setCurrentStore(Mage::getModel('core/store')->load(Mage_Core_Model_App::ADMIN_STORE_ID)); $installer = new Mage_Sales_Model_Mysql4_Setup; $attribute = array( 'type' => 'text', 'backend_type' => 'text', 'frontend_input' => 'text', 'is_user_defined' => true, 'label' => 'Amazone Order Id', 'visible'…