Could just show "Apple transaction fees" as a separate line item instead of just the total. Everyone should be more accustomed to that than a possibly sketchy looking message.
Yeah making it itemized on the payment screen would be fine. As long as the stated amount and the final total weren’t different, like sales taxes in US stores. No “$10… just kidding now it’s $13”. But listing it on the “bill”, yeah, wouldn’t mind a bit if they were forced to do that.
