Want to add Magento Extension in Joomla Site

Hello Team, Here currently have a Joomla website that requires a Magento (MCE version 1.9.1.0) shopping cart to be configured to display products from a provided pricing data, as well as incorporate data from an API key(s) from a 3rd party print design application. The final product is a printed product... not the design. What the site is selling is business cards, postcards, letterheads, stamps and other printed products. So in example of a business card, no matter what the design looks like the prices and upsells in options are constant from a price table (which we will provide). All pricing, product information, API keys have been tested prior and will be provided for setup. Good example of another site using the same API with similar products and checkout is [login to view URL] to give an idea. Thanks