Does anyone know of a script or whatever that will enable me to give my web hosting customers "credits" or "points" - so they can use those points to buy ebooks and web templates or whatever from my website (http://1and1webhosting.biz)? I think cashback would be too complicated, especially if they want to take the cash out. I want the points/credits to be applicable only to my website, to try and encourage loyalty... Thanks in advance