Handle changed address from Apple Pay sheet

[isaacfreeman]

It's possible for customers to change the delivery address from the Apple Pay sheet. We should either lock this down to prevent changing the address, or respond to the change by updating the shipment.

The latter can be done in app/assets/javascripts/solidus_paypal_braintree/apple_pay_button.js by giving the session an onshippingcontactselected handler

  var session = new ApplePaySession(SolidusPaypalBraintree.APPLE_PAY_API_VERSION, paymentRequest);

  session.onshippingcontactselected = function (event) {
    // TODO: Update the order
  };

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