ANZ eGate payment integration with WordPress site

We have a WordPress website running the QNS booking plugin. The plugin only works with Paypal, and we need it to work with the ANZ egate payment system so that payment can be accepted in Fijian Dollars. There is this plugin [login to view URL] which Cyber Extensions have told us can be modified to work with the QNS booking plugin. Although if you wish to do it another way that is fine. Need someone to make the site work with the egate payment system, setup and test.