Xamarin Forms Prayer Times - How To?

Hi,

I am developing a prayer time app which will send push notifications on prayer times.

Prayer times for Muslims is 5 times a day and it depends on the local time

So I am checking the current location using latitude and longitude and then checking the prayer times using a web service.

My question is what's the best way to do it?

Let the app connect to the the web service every minute and check if there is a pray then send a push notifications?

Thanks,
Jassim