We require you to modify the code for our existing Opencart payment extension so that it passes necessary Instant Payment Notification information back to Opencart for order completion.
The information needs to be sent to Opencart's [login to view URL] page automatically upon a successful payment so that the order in Opencart is marked as completed.
Currently it is necessary for the user to click a link to return to the cart for it to process the order as complete.
If the link is not clicked by the user then there is nothing returned to Opencart and no order is processed.
We wish to retain the link but do not want it to return information, we need this to be done automatically.
We are using Opencart 1.4.8 which is written in .php and the National Australia Bank Transact Hosted Payment Page Integration extension.