Adding order information to after_end.php

this worked great. i'm trying to add to the cart using ajax now from an article already inserted this code

<a href="index.php?option=com_hikashop&ctrl=product&task=updatecart&quantity=1&checkout=1&product_id=36" onclick="try{ new Ajax('index.php?option=com_hikashop&ctrl=product&task=updatecart&quantity=1&checkout=1&product_id=36', { method: 'get' }).request(); }catch(err){ new Request({url:'index.php?option=com_hikashop&ctrl=product&task=updatecart&quantity=1&checkout=1&product_id=36', method: 'get'}).send(); } return false;">Add to cart</a>

the code works but i don't see a way to call a popup or for the cart module to update with the ajax. how do you get either a popup to display or the cart module to update with the ajax on the page?

on the after_end.php i get the url index.php?option=com_hikashop&ctrl=checkout&task=after_end&order_id=37 but it is a blank page. i have the redirect set I see the "thank you for your order" for a second. i have it redirecting to my-account/my-downloads. but it never makes it there. on the end.php one that doesn't use a payment it works perfectly. Please help