Re: [w3c/payment-request] redact full shipping address from event until payment response (#648)

You'd need to wait for [onpaymentauthorized](https://developer.apple.com/documentation/applepayjs/applepaysession/1778020-onpaymentauthorized) then do something like this:

```
session.onpaymentauthorized = (event) => {
    if (isPOBox(event.payment.shippingContact))
        session.completePayment(STATUS_FAILURE, [ new ApplePayError('shippingContactInvalid', 'addressLines', 'Cannot ship to P.O. boxes') ]);
};
```

The user would be prompted to correct the shipping address and retry the payment.

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