public function paymentEvent(Varien_Event_Observer $observer) {
    $this->log("Entramos al observer");
    $quote = $observer->getQuote();
    $store = Mage::app()->getStore($quote->getStoreId());
    $cartItems = $quote->getAllVisibleItems();

foreach($cartItems as $item) {
  $newPrice = $this->getNewPrice($item->getPrice()); // Function that calculate the newPrice (%)

$this->log("Observer END");
return $this;


This function change the product prices depending the payment Method selected.

Observer Method Event: sales_quote_payment_import_data_before

But if for some reason the customer changes his payment method, the prices keeps at the same amount.

Example: first i choose Payment Method Y and works ok, but if for some reason i need to changa the payment method and i go back to step 4 and now i choose payment method Z, all the calculates are made with the payment method Y, i need again to go back to step 4 and choose again Payment Method Z and now it shows the prices ok.

Theres any form to flush the payment method choosen if the customer go back to step 4 or another one?

  • did you verify that, you get recent selection of payment methods when observer called? – Dhiren Vasoya Jan 3 '17 at 3:19
  • Yes i have a log file, there's shows that information, and looks everything ok. I don't know whats happening but if i change to another payment method i need to choose it twice. Because the firstone still haves the information of the firstime that i choosen the payment. – Waskalle Jan 3 '17 at 18:22

First, sales_quote_payment_import_data_before event fire when importData(array $data) is called.

So, you need to change when you have changing the payment gateway that times,need to ensure that $QuoteObject->getPayment()->importData($data) called.

Also after run $item->save();,you should called


for calculated total price and assign new price to quote

  • public function fetch(Mage_Sales_Model_Quote_Address $address) { // my code is here } I Change the observer for a Model Class which is executed after payment Method is selected. My log file shows all ok, ut I still need 2 times to choose the payment method to update the view – Waskalle Jan 3 '17 at 17:43
  • Do u know wich event was executed after paymentMethod is choosen? – Waskalle Jan 3 '17 at 23:39

I know this answer is late, but had the same question / problem using observer sales_quote_payment_import_data_before...

the code uses the old payment method.

To get the new chosen method, you can use:


You'll get:

[payment] => Array
        [method] => method_code_chosen

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