*** Special note ***
On iOS if a user initially declines push notifications then the app will not be able to attempt to set them up again later. The only way for the app to re-ask this is if it is uninstalled for at least one day.
See also:
https://developer.apple.com/library/ios/technotes/tn2265/_index.html#//apple_ref/doc/uid/DTS40010376-CH1-TNTAG42
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