What is the pin for zwinky zcard

There isn't just one pin number there all different and if u don't have a zcard then go to a store and purchase one there only 5-20 bucks not that expensive. And when your card has no more money on it there should be a pin number on the back of the card. When you first sign in on zwinky there's this thing at the bottom of your zwinky picture that says redeem gift card then you enter in your pin.