Project like GumRoad.com (exact, fully operational with some extra features) by dhimansaha

I would like an exact, fully operational similar to “www.GumRoad.com”, a very simple service you can see here- https://gumroad.com/ which allows sell contents online through link (URL) on social network… (Budget: $15-$25 USD, Jobs: Graphic Design, HTML, PHP, Website Design)