Barclays epdq integrated into zencart shop

Need Barclays EPDQ payment gateway integrated into a zen cart shop as soon as possible. It will be to work with multiple currencies - GBP & EUR The shop is currently running zencart 1.2.4.1 & has a fair amount of custom modifications we would not want affected. There is a module available "Credit/Debit Card via Barclaycard's secure server" which we have installed, but it doesn't appear on the checkout page, even though enabled. - the developer does say it has only been tested on zencart 1.3.8 - a newer version. So maybe it needs manually integrating in php without a pre-packed module. Fluent PHP knowledge essential - Please let us know a price for this and how soon it could be done. If this works there may be a job afterwards to upgrade the shop to the latest version of zencart.