itunes
‘your purchase could not be completed’ popped up after updating to the newest version.. any idea how to fix it?
iPhone 11, iOS 15
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If you can't make purchases or update apps, including free apps, you need to update your payment method or add a new one.
Sign in to your Apple ID account page and edit your Apple ID details.
On the Sidebar click Payment methods -> then tap Payments Methods and tap Manage payment method.
See also the following Apple articles:
Change, add or remove Apple ID payment methods
Change, add or remove Apple ID payment methods – Apple Support (UK)
Add money to your Apple ID balance
Add money to your Apple ID balance – Apple Support (UK)
Payment methods you can use with your Apple ID
Payment methods you can use with your Apple ID – Apple Support (UK)