I have installed the installation files and setup the Payment module in ZenCart. However, I am having no luck setting up the EPDQ CPI parameters as I keep getting "INVALID URL ALLOWED" from the Barclays website.

I think the problem may be the Allowed URL and/or the POST URL. What should these be?

I noticed a very old post that stated HTTPS on the POST URL was not allowed, is this still the case?

Any advice greatly appreciated.