UPS OnLine Tools is a set of server applications based on the Hypertext Transport Protocol (HTTP) and Extensible Markup Language (XML). UPS OnLine Tools provides an easy method for integrating UPS functionality into your e-commerce applications.

Building your OnLine Tools application requires:

1. Communication with the UPS OnLine Tools server
2. The submission of a request message
3. The parsing of a response message
4. Error Handling