We have PHP based web application deployed on AWS/Unix and exposed as https://sample.url. Users access it via iOS / Android App and also via desktop browser.
We need iOS push notification functionality with login functionality and registration of new users, which will send messages / notification to respective client Apps. E.g. if particular user gets message in their Inbox or Chat message via Website or PHP code, we notify that particular App user with Push notification and when they click or open it, the app is opened with particular URL e.g. [url removed, login to view]
This app needs to be integrated with our existing website login functionality.