How do I change my payment method

Click here, follow the instructions, and see the Learn More section. If you're referring to something that isn't handled through the iTunes Store system, check the service's documentation.

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In the wallet app for your phone it is very simple to do. If you go to this app or you can go to the setting app for your phone either one will work but then you can follow the steps to update your payment method then on either one of these entries then