Error message on bottom of success page, even though error reporting is turned off: array(1) { ["languageID"]=> int(1) }

I added some code to the bottom of the page, so that the language setting would remain after the session was deleted with the load of the success page,

With error reporting on, this is the error code at the bottom of the page:
Notice: A session had already been started - ignoring session_start() in /Applications/MAMP/htdocs/SEGUFIX-SHOP_2019/checkout_quote_success_canada.php on line 516

Warning: session_regenerate_id(): Cannot regenerate session id - headers already sent in /Applications/MAMP/htdocs/SEGUFIX-SHOP_2019/checkout_quote_success_canada.php on line 532

Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /Applications/MAMP/htdocs/SEGUFIX-SHOP_2019/checkout_quote_success_canada.php:144) in /Applications/MAMP/htdocs/SEGUFIX-SHOP_2019/checkout_quote_success_canada.php on line 536
array(1) { ["languageID"]=> int(1) }

file in PM

The code on the bottom of the page is from some leftover debug code on line 540:
<?php var_dump($_SESSION);?>

just delete that line.

On line 516 you have:
session_start();

You can't start a session in the middle of the page, and you can't start a session that has already been started (it is started on line2). You probably just have to delete that line.

Actually I see you seem to be trying to reset the session entirely on the bottom of the page... I think you have to delete the session start on line 536 as well. Really I don't think lines 530-536 are necessary.

I got rid of the code, and the language session remains like intended.

The mini cart is not deleted. At least not when the success page has loaded. When I switch to another page, it is empty.

If you want it deleted before the page loads then the code has to be on the top of the page, not the bottom.

With the code on top of the page, it deletes all contents before, so instead of opening the success page with all order information, it opens the empty cart page.
I am not sure why it worked before, but the language session remained, the success page showed all the order number and the mini cart was empty with a zero amount..

Second page attached with this comment. It would not save two attachments with the same name.

It should probably be cleared below so you can show the cart contents above. Where is the mini cart coming from? I searched the page for "net amount" and I don't see it anywhere... maybe it was accounted for on the include that has the mini cart.

Yes, the mini cart is in the navigation includes document. It is part of the template and above the content code. I would think, if I ended the session before the navigation include and after the content, it should work. But that doesn't work, because the navigation is above the content.

I am not sure how it was cleared before without erasing the success page. The only change I made was replace the 0,00 with

<?php echo WA_eCart_DisplayMoney($segufix, $segufix->TotalColumn("TotalPrice")); ?>

so that it would use the correct currency symbol when the cart was empty

Use:
<?php echo WA_eCart_DisplayMoney($segufix, 0); ?>

It sounds like it showed zero before because it was set to zero and it wasn't actually showing the cart total.