osCommerce arrives pre-packaged with a great selection of standard shipping modules, which you will find in Administration | Modules | Shipping ready for installation. It is recommended to test each of them and observe their functionality, as this will give you a better understanding of the underlying code. Consider these ready-made modules akin to a selection of base ingredients that will be used to create new modules. While it is convenient to use one of the existing shipping modules, it is highly probable that they will require some spicing up to suit your specific needs. In this chapter, we will use the following osCommerce shipping modules as base ingredients for our recipes:
Flat Rate Shipping
Per Item Shipping
USPS Shipping
Table Rate Shipping