Does anyone know how to implement push notifications automatically between two users or more WhatsApp type? That is, when a user writes something in parsee (I have it in AWS), a notification is automatically generated for another user only (not for all users of the app) nor do I have to send it (do it automatically) and when the user receiver receives it, that when reading the message, future notifications disappear. IOS system with Xcode swift 3.0. It is impossible to find this in tutorials.