Apple App Store

Apple do not provide developers a method of offering refunds. 

If you want to request a refund you will need to contact Apple directly. Please follow the instructions Apple have provided for claiming a refund.

https://support.apple.com/en-gb/HT204084

It will then be down to Apple's discretion as to whether they issue the refund or not.

Google Play Store

Google do provide developers a method of offering refunds. 

If you want to request a refund for your Google Play Store purchase please provide a team member your order number. This will have been emailed to you or can be found in your purchase history. Order numbers begin with GPA.

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