ios - APNS Feedback Service - is it still alive? -

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when googleing ios device token expiration topic you'll find many notices apple feedback service. it's polling of device token expiration when feedback service told particular device token expired means there no chance deliver push-notification device token. should mark them expired.

now couldn't find feedback service mention in actual apple docs. service deprecated? if so, why pushsharp, pushd libraries still use it? , if so, next? read send status on google , microsoft platforms?


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