The Super Activator is used for activating the NFC Tag a.k.a. Super Tag and SuperCard for Zeta users.
SuperTag enables a zeta user to pay to any zeta-supported merchant through a single tap of the tag, whereas SuperCard enables the same for any merchant across India through a single swipe.

If you are already using Zeta for your payments, it's a cakewalk to set up these two things for you.
If you are not using it, checkout the app here : https://play.google.com/store/apps/details?id=in.zeta.android and we are sure you'll love it.