Depending on your device, refund policies are determined by the individual stores.
For purchases made within the last two hours, automatic refunds are possible with any waiting period. Simply visit the Google Play Store and navigate to Menu > Account > Order History. You may also request a refund within 48 hours of the purchase by filling out this online form.
You may request a refund for any in-app purchase made within the last 90 days. You’ll have to Report a Problem to request your refund, and a customer service rep will review your request.