Tom at Sage doesn't see why the ""partner versions of SPS"" wouldn't work with Sage Payment Center (SPC). But he did say that SPC requires IE 11 (and I think he said the latest version of Chrome), and he also said something about the latest OS of Server 2012 and 2008.
@WayneSchulz, @MoiraGoggin, I'll be interested to review the documentation for setting up the feature for posting credit card transactions to Sage 100 (A/R Cash Receipts Entry?) that are processed outside of Sage 100, e.g., via a mobile device out in the field. I'm checking back with Tom re: that documentation.