When you create your affiliate HopLink from the ClickBank Marketplace, you have the option to add a Tracking ID.You do not have to create one if you prefer not to use them, they are completely optional.
ClickBank will automatically track and report results from any HopLinks you use. However, you may wish to perform some additional tracking of your own, so you know which of your promotional efforts are working best for you.
Tracking IDs are short descriptions you create that are added to the end of your HopLinks. The Tracking IDs can be up to 24 characters long, and must consist only of numbers and/or letters (no punctuation or other symbols). When a sale is made using one of your HopLinks, the Tracking ID is passed into ClickBank's reporting.
For more help with creating, testing, and tracking your HopLinks, please click here.