Hi cardsup,

I haven't done anything on this just yet. I think that Ryan is working on putting support for recurring payments into core and the developer of the Payflow module may be improving that module. I still have a little time before I need this, so I figured I'd wait to see those rather than head in off my own direction. (Though I would certainly be happy to help them, if there's anything I can do).

Sorry that I'm not more help yet...