The great thing, is I give you a specially designed link that you send your friends to... Once you friend clicks on the link, it is locked, it adds a Persistent Cookie....
That means anytime that the same user goes back to the website, and places an order, a month or 6 months later, you will still be acknowledged for the resale. Your affiliate id will automatically be posted in the promotional code box, and the user will not be able to modify it.
webDivisor. your order page is not even on a secure server... i wouldnt enter my card details on that page.
also, i dont think international customers can sign up for your service, because your postcode field requires a 5 digit number, here in australia we only have 4 digits, also your phone number field has same problem, thats not how everyone elses phone number looks like. you also didnt ask the user for their country..
i guess your only doing business in the US?