Australian payment gateway adapter for Pay API Is anyone aware of a working code for the Pay (7.x) module that will process payments over eWay or NAB Transact?

I am considering writing adapters for these gateways, but though I would put out a call for any existing code to start from.
There are a few modules floating around for commerce, CiviCRM and Ubercart that use eWay, they would be good basis.