Cashback and discount coupon website

I want to create a cashback website for the brazilian market. It needs all the features as these sites: [login to view URL] and [login to view URL] I must be able to update the offers and control the registered visitors cashback. I must be able to register new affiliates offers and be able to decide how much I am going to pay back. Example: I register an offer for a [login to view URL] website selling a TV that costs 1500. They are paying me 5% comission as i am registered as an affiliate seller for them. I want to be able to GIVE BACK, let's say, 2.5% to the buying customer that bought the TV through my website, AFTER I get paid from the retailer. A good look at how the two sites work, will make things a bit more clear. As the site is for the Brazilian Market (portuguese language), All animations, GIFS, banners, etc must come with the source that can be easily translated locally. Please ask any questions you might think relevant