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You can use the NH SDK to do this. The object that has the token is this one using their SDK:
https://msdn.microsoft.com/en-us/library/microsoft.servicebus.notifications.appleregistrationdescription.aspx
Most likely, the easiest way to find the registration you are looking for is by tag, so you may be interested in this function: https://msdn.microsoft.com/en-us/library/dn369602.aspx