Debugging and Customizing Order Success Page in Magento 2

The order success page only shows after completing a successful order. Without that order the page redirects, and you won’t be able to see it. Yet, doing a ‘quick order’ over and over just to check if the order success page finally looks the way it should is an incredible waste of time.

Here’s what I do instead:

First, I pick a line in sales_order table and extract columns quote_id, increment_id, and entity_id. The following mySQL-statement will get the latest order from the DB. (Adjust to your needs!)

SELECT
    quote_id,
    increment_id,
    entity_id
FROM
    sales_order
ORDER BY
    entity_id
DESC
LIMIT 1;

This will give you something like this:

+----------+--------------+-----------+
| quote_id | increment_id | entity_id |
+----------+--------------+-----------+
|      146 | 000000104    |        91 |
+----------+--------------+-----------+
1 row in set (0.000 sec)

Now, I hardcode the following in lines into the __construct()-function of vendor/magento/module-checkout/Model/Session.php in my local development environment:

$this->setLastSuccessQuoteId(146); // sales_order.quote_id
$this->setLastQuoteId(146); // sales_order.quote_id    
$this->setLastRealOrderId("000000104"); // sales_order.increment_id
$this->setLastOrderId(91); // sales_order.entity_id

Now calling //<local-magento-host>/checkout/onepage/success/ will always show a success page.

Happy coding, Manuel

Update [2024-11-01]:

The proposed changes in the constructor of Session.php only work if no customizations exist for the checkout success page. You may need to add more settings or perform additional initializations to make it work. I just stumbled over some custom Google Analytics code that causes errors on the checkout-success page when I initialize Session as described. In this particular case, commenting out offending code solves the problem. So, if you try this ‘trick’ as well, proceed with caution.