In general you should not assume that an order is going to be completed successfully. Normally when a checkout is created with eCart you will have the option to manage the orders in your db. When the wizard is completed it will create the checkout pages and include the store order summary and details server behaviors on the confirm page.
If you are using a local checkout and do not have a set of pages created by the checkout wizard then you can add in the store order summary and details server behaviors to your checkout success page.
Please describe a little more about you current setup and what you are trying to accomplish in the end. Post back with a copy of the checkout page in a zip archive for reference.