I'm not sure about the version coming out, but I've been working through this Paymentech/Authorize.net issue myself.
In order to use Paymentech Orbital, do you go to
https://www.paymentech.net/manager? When I tried to use the Paymentech Online Payment Manager, one of the techs told me to go to that site, and whatever I type in as the group number is the Login that goes on the Online Payment Manager.
Of course, it turns out that I have Authorize.net through Paymentech, (not sure how that happened) so this doesn't work for me, but it might work for you.