Subscriptions and Purchases
I would like to request a cancellation on a purchase I just made from the App Store. I inadvertently purchased the app in error and would like a refund.
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See here: Request a refund for apps or content that you bought from Apple - Apple Support
If the App had a subscription that activated automatically follow the steps here to cancel it: See or cancel your subscriptions - Apple Support
Then contact iTunes / Apple support for a refund.