This is an advanced feature. You must have both powertrack extension and Unifaun extension before you can buy and use this package.
This advanced feature called: Powertrack fusion Unifaun, lets you associate Unifaun tracking number (return by the booking api) with the order.
Powertrack will use this tracking number to show tracking information to the customer (by showing the tracking number in the tracking column for example). Customer can track his order on Unifaun by clicking on an Unifaun link.
Powertrack fusion Unifaun