1.Override block
Create the file app/code/Vendor/Module/etc/di.xml and add the following:
<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../../../vendor/magento/framework/ObjectManager/etc/config.xsd">
<preference for="Magento\Checkout\Block\Onepage\Success" type="Vendor\Module\Block\Success"/>
</config>
Create the file app/code/Vendor/Module/Block/Success.php and add the following:
<?php
namespace Vendor\Module\Block;
class Success extends \Magento\Checkout\Block\Onepage\Success {
public function getOrder() {
return $this->_checkoutSession->getLastRealOrder();
}
}
Override template
Create the file app/code/Vendor/Module/view/frontend/layout/checkout_onepage_success.xml and add the following:
<?xml version="1.0"?>
<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" layout="1column" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
<body>
<referenceBlock name="checkout.success" template="Your_Module::checkout/success.phtml"/>
</body>
</page>
Create the file app/code/Vendor/Module/view/frontend/templates/checkout/success.phtml and add the following:
<?php /** @var $block \Vendor\Module\Block\Success */ ?>
<div class="checkout-success">
<?php if ($block->getOrderId()):?>
<?php if ($block->getCanViewOrder()) :?>
<p><?php echo __('Your order number is: %1.', sprintf('<a href="%s" class="order-number"><strong>%s</strong></a>', $block->escapeHtml($block->getViewOrderUrl()), $block->escapeHtml($block->getOrderId()))) ?></p>
<?php else: ?>
<p><?php echo __('Your order # is: <span>%1</span>.', $block->escapeHtml($block->getOrderId())) ?></p>
<?php endif; ?>
<!-- BEGIN VENDOR_MODULE CUSTOM -->
<p><?php echo __('You ordered %1 items.', (int) $block->getOrder()->getTotalQtyOrdered()) ?></p>
<!-- END VENDOR_MODULE CUSTOM -->
TIP
You probably want to refresh your checkout/success page a lot, so to tackle that problem, go to file app/code/Magento/Checkout/Controller/Onepage/Success.php and change at line 22.
$session->clearQuote();
to
// $session->clearQuote();
This way, your quote won’t get cleared when you open the page.