The CSV integration option is the preferred method when used in a couple of different scenarios. The first and most common is when you have a list of orders that did not result from a shopping cart but instead were created from something like trade show sales, or phone orders. These orders can be put into a spreadsheet and imported to XPS Ship as a group. Another situation when it might be useful is if you track orders in a system that is not integrated with an eCommerce site, for example, most CRM's or a custom database. All shipping functions can be completed on those orders, however, with the CSV option, the tracking number is not exported anywhere. It is still recorded in XPS Ship, but there is no "output" from the shipping process to the source CSV file, whereas, with a shopping cart integration, the tracking number is pushed back to the shopping cart.
XPS WebShip