Promo codes are unique codes that can be redeemed on this page in exchange for in-game content in War Robots: Frontiers. 
 
Here's how to reedeem a promocode:
 

• Sign in to the War Robots: Frontiers website using your account information. If you are logging in with an account created through a third party (i.e. Steam, PlayStation, Xbox), please make sure to click the account log-in option (do not sign in with email).
• Go to the following page: https://warrobotsfrontiers.com/promocode.
• Enter your promocode, view its contents, and then redeem it.