OneSignal(formerly GameThrive) is a push notification delivery service designed specifically for mobile games, apps and websites. It is available as a Corona plugin for free to all Corona developers.
OneSignal can be set up in less than 15 minutes and provides segmentation targeting, localization, scheduled push and real time tracking. OneSignal currently supports native Apple and Google push notifications and comes with libraries for native iOS, native Android, Corona SDK and Unity.
Plugin Documentation: https://docs.coronalabs.com/plugin/GameThrivePushNotifications/index.html
Plugin Daily Build documentation: http://docs.coronalabs.com/daily/plugin/GameThrivePushNotifications/index.html
Original Announcement Corona Blog Post here:
If you have any questions regarding GameThrive, its functions or otherwise, please post them in this forum and we will do our best to answer your questions in a timely manner.