Magento how to update billing/shipping order before place order for guest.

I know what observer event I need to use and familiar with it. What I want to know is how to get billing/shipping or and what code write to update it. I've only found information about how to update a address of already placed order.


I did not try this code so you should refine it on your own: you need to have an observer that has a function to update the billing and shipping address, here is what you need to do in your xml:


then in your observer you need to check if the account is a guest account and then update their quote:

public function updateaddress(Varien_Event_Observer $observer) {
    $session = $observer->getEvent()->getCheckoutSession();
    $sessionCustomer = Mage::getSingleton("customer/session");
    $quote = $this->_quote = Mage::getModel('sales/quote')->setStoreId(Mage::app()->getStore()->getId())->load($session->getQuoteId());
    $address = $quote->getShippingAddress();
    if (!$sessionCustomer->isLoggedIn()) {

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