Here are the details surrounding the Bulk Shipping Platform. This will provide an overview of the bulk shipping platform, and the objects/calls used to extend it using Apex and Visualforce.

Documentation

FedEx Docs

UPS Docs

USPS Docs 

Packages

For the latest FedEx, UPS and/or USPS packages, please obtain them from the AppExchange.

To enable bulk shipping, please install the following package.

(Note: if installing into a sandbox org, change "login.salesforce.com" in the URL to "test.salesforce.com")

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