Creating a Custom Shipping Method
You must create a new shipping method when you want to support a new way of shipping items such as overnight delivery service. If you need a new way to calculate the charges for shipping via the new shipping method, you must also create a pipeline component to calculate the shipping cost. This pipeline component is called a shipping cost calculator. For example, you might create a new shipping cost calculator to call a Web service that calculates shipping charges for a particular shipper.