The Premium Lucky Spin is a feature that will give you really interesting prizes!
To access it, go to the Lucky Spin, on the left of the "Missions" section, and once there, click on "Premium" at the bottom of the screen.
There you will find gold bars and a special chest. You will have 100% chances of getting more gold bars, and, if you get the chest, more chances of getting a special combo.
The Premium Lucky Spin costs US$ 4,99. Bear in mind that you will only have one spin for every purchase you make. Once you complete the purchase, you will be able to spin the wheel, but if you want another spin, you will need to pay again.