A high-end solution may be bought or rented as a stand-alone program or as an addition to an enterprise useful resource planning program. It is usually put in on the corporate’s net server and may combine into the present supply chain so that ordering, payment, supply, accounting and warehousing could be automated to a large extent. Other solutions permit the user to register and create an internet shop on a portal that hosts a number of retailers simultaneously from one back office. Open source buying cart packages include superior platforms similar to Interchange, and off-the-shelf solutions corresponding to Magento, osCommerce, …