PHP url redirect script for a Joomla eCommerce extension.

Hello, I'm creating a new website and I need some features with a Joomla extension called DigiCom. It's a shopping cart which support selling ebook, software etc. with subscription system. I have 2 types of products, with downloadable files and without downloadable files with fixed (1 or 2 months) subscription. What I need is a php redirect script based on below conditions: 1. If customer purchased downloadable products and subscriptions expired then redirect "documentation" to "documentation-demo" 2. If customer purchased normal products (no download files) and subscriptions expired then redirect "books" to "books-demo" Above action needed for registered users only and no need for guest visitors. Budget not more than $15.