Canceling an app purchased from the apple store by mistake
how can i cancel an app purchased by mistake
iPhone 6, iOS 12
You can’t cancel a purchase. Once you agree to buy it, you have bought it. Mistake or no mistake. You can ask Apple for a refund, though they are not obligated to give you one unless the app doesn’t work or doesn’t work as advertised.
Request a refund for an App Store or iTunes Store purchase - Apple Support