Zombie Medals are the currency of Lollipop Chainsaw, widely accepted amongst zombie hunters. Juliet obtains them by killing zombies; more stylish fighting yields a greater payout, with successful Sparkle Hunting providing the biggest bonuses. Once accumulated, they can be exchanged at Chop2Shop.Zom.
There are two types of Zombie Medals: Ordinary, bronze-coloured medals, and Platinum Medals. Ordinary ones are used to pay for items with a directly useful in-game purpose, such as upgraded abilities and new moves. The much, much rarer Platinum Medals are reserved for additional content, namely concept art, new songs, and new outfits for Juliet to wear. One Platinum Medal can be purchased for 500 regular Zombie Medals, but it's generally easier to just play through the game.