Is Sub IDs tracking option available?

Yes, you can add &subid=XXXXXX to your links to track quality of your sources.
To use this option properly, please, make sure your link looks like this:  

By going to Popunders -> Statistics -> Sub IDs in your TubeCorporate admin panel, you'll see productivity of your sources.
You can sort data by Productivity and get a list of Sub IDs which affect your eCPM in a negative way. 

NOTE: Productivity is based on a ratio of Clicks to Unique Visits, so the smaller is the percentage of productivity of a source - the worse is a quality of its traffic.

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