First Data Global Gateway integration?

Client wants to use First Data Global as their Gateway. Instructions say that this Gateway can be used with Wordpress, with eShop as their example. The idea is that the cart must have Authorize.NET SIM as a usable Gateway. Reviewing Marketpress Gateway options, I do see Authorize.NET AIM capability, but not SIM.

The site also includes instructions on editing eShop here.

So, before I go running to eShop, I thought I'd just ask if anyone is using this Gateway with Marketpress? Thanks for your time!