Payment System Script

I need a File Payment Script like this: File Payment System Should run on [login to view URL] All sales from another website should be deducted on projectname.com. Important is, that the payment use should only is global "Global File Payment System" and that it's changeable in small Payment System Admin Area. Payment via PayPal, Moneybookers,Egold and optional via daopay. Should be possible to put on/off in admin area. After payment the download link should be showed on [login to view URL] (no redirection back to the (product)file website. If someone download first time via the file payment system it should create user accounts only with the (PayPal) email and password, next users should only be login with email and password to proceed the payment via the system. If users login they will see their sales with the download link. So the customers can download again their sales (files) for maybe period of time. (This period of time should changeable in payment admin area, too) The payment system should be useable for webmasters as a simple file payment system. They can register with (PayPal) email and Password. Then they get an email with activation link to active the account. If they login, they will see categories Files sell / Files buy / Earning (incl./excl. provision fee) or called something like this and a link to their webmaster Payment cart code to integrate in their sites. Should work like this: Code should be useable for every file on every site that should be use the pay per download Payment System and should detailed track (count) downloads and views in the webmasters account areas. Download provision fee should be set standard 15% (also changeable in payment system admin area). That's it :)