To request a refund for your In-App subscription, you will need to contact the app store where you made the purchase.
In-App subscriptions are processed directly by the app store. You will need to request a refund for your subscription from the app store where you made the purchase.
Refunds for purchases made via the app store cannot be processed from the website or by the website admin.
Here are the links with instructions on how to request a refund: