How do I know if my push request via SDK was successful?

Answer:

Push, as a principle, does not guarantee delivery because its not possible to receive responses for messages that have succeeded (so measuring success is therefore impossible). 

In any case Nexmo (or any of our customers) cannot know or control what a given handset settings are (i.e push notifications completely disabled, disabled for some chosen apps etc.) as this is purely end-user behaviour.

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