Integrating WPMU Membership with new payment gateway

Hey there,

I'm trying to look into integrating Membership Pro with :

http://www.goemerchant.com/

Do you have any instructions / recommendations? I tried to follow a tutorial which utilized the 'authorize.net' gateway, with a couple modifications / tweaks but that didn't appear to work.

http://support.goemerchant.com/payment-gateway.aspx?article=authnet-emulator-gateway-api
http://support.goemerchant.com/payment-gateway.aspx?article=authnet-emulator-gateway-api

Please advise.