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In addition to sending notifications across multiple platforms, OneSignal provides easy to use tools to schedule and automate notification delivery. For instance, you can set up campaigns to re-engage inactive users. OneSignal provides everything you need to quickly set up and start sending notifications to your users. Best of all, OneSignal is free has excellent support.
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Or browse our Cocos2D-x setup guide here: http://documentation.onesignal.com/v2.0/docs/cocos2d-x-sdk-overview