I currently sell a Mac-only productivity tool that uses visual and audio notifications to remind the user of certain events taking place.
I\'ve started planning the
You'll need to implement APNs (Apple Push Notification Service) in both your app and your server.
To clarify a few things:
It's not a challenging task for an experienced iOS developer or an experienced PHP developer, since Apple's documents and APIs are pretty straightforward. However, configuration on the server side can be a little tricky.
I believe Stack Overflow already has tons of information on how to enable APNs in iOS apps. All you need to do is be specific in your question and do the search work beforehand.
Hope that helps.