Part of obtaining UPS OnLine Tools is licensing: agreeing to the terms and conditions of using the tools. Once you are licensed you are issued a Developer's key. The Developer's Key gives your business access to the documentation for UPS OnLine Tools*. Different keys are issued for end users and third-party developers.
(* Does not include documentation for UPS Signature Tracking or UPS Shipping. An end user must first complete a request form to access the documentation for these tools.)