This tutorial is for Ubercart versions later than version 2.3. If you're using an older version of Ubercart, you'll want to see this example. This example is very similar, but accommodates the changes made to the template system in Ubercart.
This tutorial is for Ubercart versions earlier than version 2.3. There is a newer version of this example for Ubercart 2.3 or later.
In this post I'll show how to set up an extra token for use in an Ubercart template. This will require creating a custom module (because we don't really want to modify others' modules). We'll use a few different hooks to create the token, and then simply modify the template to include this token. This setup requires the token module (which is required by Ubercart), so make sure this is enabled!