I am interested in developing a website that could act as a loyalty/cash-back program for a membership organization. The site would allow a group of members to create individual user accounts and then browse/shop at various affiliate sites. All purchases would be tracked and the members would have their accounts credited accordingly. I know there are other sites that do this – is it something we would have to build from scratch, or are there existing tools (3rd party solutions) that we could leverage to build such a site. Do the affiliate networks (e.g. LinkShare, CJ) allow for this level of tracking across many members? Any input would be much appreciated.