Push notification system features
Content delivery and reliable channel        
- Dedicated real time background channel (XMPP)
- Apple APNS & Google FCM / HMS best effort services
(App wake up if offline)
Customizable message validity period/retrying mechanisms
Single message status tracking

(including read)
Rich media and long text support
Text personalization with variable/massive sending
2Way communication via API
SMS fallback
(via API)
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