In most cases, Apple handles all billing matters themselves.
To request a refund, it’s best to contact Apple directly through their Support System.
We can credit currencies purchased through the App Store to your account, but we cannot refund currencies purchased through the App Store.
We can return Google Play purchases if you have a receipt with an order number (GPA).
When you make a purchase on the Google Play Store, Google sends you a confirmation email that can be used as a receipt. The order number (GPA) can be found in this receipt. To get a refund, contact our support at email@example.com and don't forget to include the GPA number in the description of your request.