Magento how to stop /checkout/onepage/success/ redirecting

You can stop checkout success page redirection after refresh page, for styling and testing purposes, with this below code:

Go to this file:

vendor/magento/module-checkout/Controller/Onepage/Success.php

and comment Out Line No : 22

//$session->clearQuote();

Now you will be able to refresh and debug success page without redirecting.

Don't forget to uncomment after working.

You can change the /app/code/core/Mage/Checkout/controllers/OnepageController.php file. Modify the successAction, so it looks like this:

 public function successAction()
    {
       /*
        $session = $this->getOnepage()->getCheckout();
        if (!$session->getLastSuccessQuoteId()) {
            $this->_redirect('checkout/cart');
            return;
        }

        $lastQuoteId = $session->getLastQuoteId();
        $lastOrderId = $session->getLastOrderId();
        $lastRecurringProfiles = $session->getLastRecurringProfileIds();
        if (!$lastQuoteId || (!$lastOrderId && empty($lastRecurringProfiles))) {
            $this->_redirect('checkout/cart');
            return;
        }

        $session->clear();
        */


        $this->loadLayout();
        $this->_initLayoutMessages('checkout/session');
        Mage::dispatchEvent('checkout_onepage_controller_success_action', array('order_ids' => array($lastOrderId)));
        $this->renderLayout();
    }

Remember to remove the comments when you're done!