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Apple (iOS)
Subscriptions bought with Apple are handled solely by Apple. If you've bought a subscription there, you have to claim a refund directly at Apple.
Go to reportaproblem.apple.com or look for the link "Report a problem" on your iTunes bill
Enter the Apple ID and password that you used to buy the item, then choose Sign in
Choose Report a Problem next to the item that you need help with
Select a reason from the menu
Follow the onscreen steps
You might need to send more information to Apple but usually not
More information at https://support.apple.com/en-us/HT204084
Please note that in case of Apple in-app payments, the rules, terms and conditions of Apple apply. We have no influence on Apple's decision to decline a refund whatsoever.
Google Play (Android)
Take a look here and and follow the steps to receive a refund.
Or send us your Order Receipt that contains an number starting with GPA-
