Coupons let you access different premium features.

Coupon cards

• Building GU STARS (200, 1000): Reduces the cost of a STAR-building by 200 or 1000 STARS
  
  
  
  
• United cup: Free participation/creation of a United cup
  
  
  
  
• United tournament: Free participation/creation of a United tournament
  
  
  
  
• United league: Free participation/creation of a United league
  
  
  
  
• United 1on1: Free participation/creation of a United 1on1
  
  
  
  
• Worker: Allows you to cut the construction or rapair time of your current construction project in half
  
  
  
  
• Practice match: Free participation/invitation in a practice match
  
  
  

In your list of coupons you can also find coupons for buiding upgrades, Plus staff and Top Team matches (these coupons appear only when you have them unused).