I'm pretty sure I went through this same process for a client of mine about a year ago. I believe the ""Payment Mgr Services"" is just a fancy name for customer self-service portal. I remember fretting over all the file layouts that WF sent. In the end, everything could be accomplished by using the ACH configuration, and it only required minor changes in the Sage ACH setup. Before you spend a lot of time, you could probably setup the ACH account using the attached file, and see if your WF rep could test a file from you that has a few test checks in it. I've included the fields that we populated. This is a current, working ACH setup between my client and W.F.. If it doesn't work, then you could see if something more complex is required.