Question: I am trying to extend my app with a push service.
Looking through the web I found several ionic examples, yet have not been able to wrap my head around it.

Here's my goal:

My server should send a push notification about every 3 hours to each individual user to update them on their individual parameters.

Hence, I need a server solution that targets the package to each individual.
On the client side I thought of using

<https://github.com/phonegap/phonegap-plugin-push>

I already obtained apple push certificates but am not sure how to use them...
Any help is welcome!

Answer: 
As per your requirement analysis I would recommend to use Ionic's push from Ionic Cloud API with matchless compatibility across all platform you can find you more about it here

[Ionic Push Notification Docs](https://docs.ionic.io/services/push/)

More over it provides online portal for certificate configuration area minimal onboard configuration required extending the functionality it also provides online portal for sending out push to your devices along with Restful API services for server utilization.

For Tokens : Ionic will be responsible of generating token all you need to do is save that token on your localdb for future reference to send push notification to targeted device. Tokens will be generated one time only upon first run of the application. (Token needs to be renewed upon New install / Update)
At first Install following Plugin under your project 

cordova plugin add <https://github.com/phonegap/phonegap-plugin-push>

Download following code from here: <https://drive.google.com/open?id=0B_-b-DfCLwKdREkwZFdYVEhYWXM>

Then merge code in your app.js and after that run your application in iphone and check in console device if you are getting token or not, if device token is showing then move on to next step.

Then you can store device token in database when user login or register.

Then enter your [.pem] file location and pass phrase in [db.class.php]

Then enter device token in [sendIphonenotification.php] file 

Then execute [sendIphonenotification.php] file and check your iphone you will get a notification.

Also, if you face any issue in generating .pem file and passphrase then you can follow this link: [Generate .pem file Used to setup Apple PUSH Notification](https://stackoverflow.com/questions/21250510/generate-pem-file-used-to-setup-apple-push-notification)