How do I make a payment bia paypal
How do I make a payment via paypal
iPhone 6 Plus, iOS 11
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You need to add Paypal as a payment method for your Apple ID to use it in the iTunes, iBooks and App stores.
See here: Change, add, or remove Apple ID payment methods - Apple Support
Note that Paypal is not supported in all countries as a Payment method for your Apple ID. See here: Payment methods that you can use with your Apple ID - Apple Support