I forgot to mention before, but if you're going to be doing a CPA offer, it's probably best just to do your own. Besides the CC part, you could create a back-end for placing network pixels, a cookie system so that only the current session's CPA network's pixel gets fired, a database to record the network, affiliate IDs and sub-ids as a back-up method of tracking and one that you can use to see what publishers/networks are sending crap traffic that always cancels before rebills.