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I think it's possible that Apple might be developing a payment system that doesn't depend on NFC that is tied to iTunes accounts.

Why not both.

They could use NFC to power a collection of apps that allow you to charge to your iTunes or a 'local' account. As I recall that is what the Starbucks QR app does. It has the balance of your Starbucks gift card and to pay you input the amount and a QR comes up that the cashier scans. So why not a tap to do the same thing. Tap to validate your metro card and so on.
 
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