Hi,
@Jheroen :
If you activate the "Display view files" setting of your HikaShop configuration. Then, do an order with the payment method you want to check and go to the thank you page. There, it will tell you if it's checkout/after_end.php or checkout/end.php that is used to display the main area of the page.
The only case this wouldn't help is if you set a return URL in your payment methods. In that case, it will use another page of your website I don't know about.
So if you want us to tell you exactly ( more that what I already wrote ), please provide a screenshot of what you see at the end of the checkout for each of your payment methods with the URL of the address bar of your browser. Please also provide a screenshot of the settings of your payment methods so that we can know how you configured them (I actually already asked you about that a few messages ago).
@Bprak :
No, this plugin doesn't use Enhanced Ecommerce and I don't know of a plugin which does for now.