Hi,
I would recommend downloading all the files of the website and doing a search on all the files to find what you need. Otherwise, it's hard to say where is what as there are many ways to do it.
If it was done correctly, then it should be in a plugin of either the groups hikashop, hikashoppayment, hikashopshipping or system, and it should implement one of the order events:
www.hikashop.com/support/documentation/6...mentation.html#order
So if the search for celigo code doesn't yield anything, you could search for the onAfterOrderCreate or onAfterOrderUpdate events in the plugins of these groups.
Now, it's also possible, but a lot less likely, that the developer created an override of class.order in order to add its code to the
save method ( as per
www.hikashop.com/support/documentation/6...ntation.html#classes
). But I doubt it.
Another possibility would be that the code is added in the core files of HikaShop in administrator/components/com_hikashop/classes/order.php in the save method.
Another possibility would be that the developer added the connection to celigo in a view override of the thank you page so you could check if you have files in the templates/YOUR_TEMPLATE/html/com_hikashop/checkout / folder.
A system plugin could also be coded to intercept the thank you page processing, or the payment notification request from the payment gateway, with joomla events like onAfterRoute or onAfterInitialize and do its thing. But I doubt it too.
However, we usually don't recommend the last 4 possibilities.