Question on the ending...

The mid credit scene was very confusing to me.

Riko caught to the Imperials, with Kay in an imperial officer's suit, correct? Did she actually join?

I didn't quite understand what Kay was taking about with that golden tracker. Was it Jaylen's? Riko didn't seem to know what. It was.

I remember Kay saying something about it being used to keep track of a mark.

I also saw it (the Golden disc tracker) on Bram's bar after young Kay broke the hologram recording of her mother. What was the significance of that?

Please help me understand this scene!