I didn’t know I was going to be charged for clicking a button. Please cancel payment
How can I cancel recent charge
iPhone 12, iOS 15
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Please read again -> Related Article -> If you see 'apple.com/bill' on your billing statement
If the charge is for a subscription that you no longer want, you can cancel the subscription.
See also this Apple article: If the subscription that you want to cancel is not listed
If the subscription that you want to cancel is not listed - Apple Support
If it is a purchase from the App Store, iTunes Store, Apple Books or other Apple services may be eligible for a refund, see this Apple article: Request a refund for apps or content that you bought from Apple.
Request a refund for apps or content you've bought from Apple – Apple Support (UK)
Take a look at View your purchase history -> click Request a refund.