Create a new OAuth application, applications allow you to deliver notifications for users, and broadcast notifications to all of them at once.
Once users approved your application, you can deliver notifications.
If you don’t want your users to buy our iPhone application, you can redirect them to Push Lite, a full featured version of the application with advertisement.
If you only need to deliver notifications to users, a write-only access will be enough. You can also request for a read and write access if you want to be able to read notifications for your users.
Users will know what access level you requested, and we suggest you only use write-only.
Contact us if you have more code samples, we like gist or github repositories.