We developed this extension to obtain a hardware identifier so we could register the device to receive push notifications.
NOTE: This does not utilise the deprecated iOS Device ID features. Instead if uses the new IdentifierForVendor.
https://developer.apple.com/library/iOS/documentation/UIKit/Reference/UIDevice_Class/index.html#//apple_ref/occ/instp/UIDevice/identifierForVendor
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