I am trying to fetch orders created in a specific period of dates using a php script. This is a most basic request that i am making to ebay:
You'll need to set the pagination attribute. eBay can only return 100 Orders per Response/Page. For 2648 orders you'll need to do 27 calls.
See eBay documentation for correct syntax:
http://developer.ebay.com/devzone/xml/docs/reference/ebay/GetOrders.html#Request.Pagination