Well first to the question from hops.. There is certainly a good possibility that you won't be paid by your feeds, Specially when you are sending a lot of traffic through proxies.. There are feeds which will look for every possible excuse to terminate your account with them and eat up all the money owed to you.. lol.. but there are others which a webmaster of a ppc should bow to and worship.. lol.. As they stay in touch with you on a regular basis and send you cautions to check the traffic quality of your engine. Ah-Ha is one fine example of that.. Every PPC wants to join them, atleast at its launch. You can imagine this from the fact that REAL PPC which is now the daddy of PPC engines still uses ah-ha, although its bids are nothing as compared to the bids of the other feed they use which is epilot. But anyway, my point is, you better consult others before you launch an engine.. and specially webmasters of other PPC engines as there is nothing more valuable than hands on expereince and webmsters do have it.
Trafficsol.. I don't really get your question.. what do you mean by integrating ? Could you please be more specific? If you need more help, PM me. I'll be glad to help you out with the limited knowledge i have, as i am the webmaster of a newly launched PPC search engine..

Regards
Cibean.
Webmaster, SearchWallet.com