iOS
Please contact Apple Support to request a refund.

Android
Please contact the Monster-Handlers with the following information:

• Your Support ID or Friend Code
  
• Your receipt with the transaction ID for your in-app purchase. To find your receipt:
  

1. Visit pay.google.com and sign in with your Google account.
   
2. On the left, click Activity.
   
3. Select an order to see your receipt.

The Order ID (looks similar to this - GPA.1234-1234-1234-12345) at the bottom of the document must be visible on the screenshot.

Amazon
Please contact Amazon Support to request a refund.

Steam
Per Steam’s policy, in-app purchases made on Steam are not eligible for refunds.