Magento offers dynamic retrieval of rates from various shipping providers. Most shipping providers require that you open an account to use online rates. Consult your shipping provider to learn how to obtain API credentials.
To enable and configure these shipping methods, expand the appropriate tabs (UPS, USPS, FedEx, or DHL) and configure the settings. The configuration of this method is similar to the configuration of a Flat Rate. The exact options depend on the service provider. To learn more, contact the specific provider.