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POAdd custom discount order in total with button
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copied!<p>I have my module with my custom discount and it's OK.</p> <p>config.xml:</p> <pre><code><sales> <quote> <totals> <aver> <class>Dani_Prueba_Model_Total_Aver</class> <after>subtotal</after> </aver> </totals> </quote> </sales> </code></pre> <p>My module:</p> <pre><code><?php class Dani_Prueba_Model_Total_Aver extends Mage_Sales_Model_Quote_Address_Total_Abstract{ public function collect(Mage_Sales_Model_Quote_Address $address){ $baseDiscount = 2.5; $discount = Mage::app()->getStore()->convertPrice($baseDiscount); $address->setCustomDiscount($baseDiscount); $address->setBaseGrandTotal($address->getBaseGrandTotal() - $baseDiscount); $address->setGrandTotal($address->getGrandTotal() - $discount); return $this; } public function fetch(Mage_Sales_Model_Quote_Address $address){ $this->setCode('aver'); $amount = $address->getCustomDiscount(); if ($amount != 0){ $address->addTotal(array( 'code' => $this->getCode(), 'title' => 'Custom Discount', 'value' => $amount )); } return $this; } } </code></pre> <p>This it is OK and when I add a product to cart, automatically apply my custom discount.</p> <p>But now I need do it with a button. When I add products to cart not apply discount and have the correct total. But when I click a button, apply my custom discount, and with other button "Cancel", cancel the discount. I need some similar like the function a coupon code.</p> <p>How I do it??</p>

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