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UWP Notifications from Background Service

Summary
I want to handle push notifications from a background-service (or an application shown as a tray icon) and show it as a native Notification in the Action Center (priority: Windows, but if it's cross platform, it works aswell).
The tray icon is optional and nice-to-have. The important thing is the application should run in the background and show notifications.
Question
Can you suggest a way to show a native (windows) notification while the application is running in the background? Maybe an overview of the current (read: not deprecated) ways of achieving this?
Details
There seem to be a thousand ways how to handle notifications in Windows and none seem to work flawlessly. UWP doesn't support tray icons (you have to do a hacky-thing with a WinForms application or WPF), Electron seems to work only when you have it as a shortcut to the Start Menu, WinForms is ugly to get to show notifications in the Action Center.
Can you suggest a way of doing this? Preferably without having to submit the application to the Store.
So far, it seems I will have to deploy a Notification Service on Azure, but I am not sure my application can handle these notifications while it is in the background.
JetBrains Toolbox provides a similar approach I want to accomplish: It is in the tray and can send notifications (like when I search for an update).

Desktop Integration in Universal Windows App

Im trying to develop an app for Windows 10 which I hope to submit to the store. I want to get access to the Taskbar APIs so I can set the progress level (green bar behind the process text).
In Windows 7 I used the some of these APIs:
https://msdn.microsoft.com/en-us/library/windows/desktop/dd391692(v=vs.85).aspx
They were wrapped by this handy library which I used in my C# app:
http://blogs.microsoft.co.il/sasha/2009/02/12/windows-7-taskbar-apis/
I cant find the equvilant for UWA Desktop Extension, Any ideas?
Mike

Basically the images are comes from the app asserts, see this: Guidelines for app assets Target-based assets session for more information. The asserts are the read-only stuff and we cannot programmatically change from the code, which means we cannot create the animation on taskbar.
The APIs like ITaskbarList3 are not available in Windows Universal App.
Basically base on my understanding, Microsoft wants to use push notification/live tile also badge to deliver the current state like current progress.

Change Notification Balloon Size

I have here a windows forms application using NotifyIcon
Everything works perfectly fine in Win 7 environment, until Win10 came...
The content of my notification balloon has 9 lines.
But when I run my app in Win10, some lines of the notification content are not shown in the balloon.
How can I resize the balloon in Win10?
[Correct] Win 7 notification:
[Not Good] Meanwhile in Win 10:
[UPDATE] Notification balloon won't show in 64-bit os. 😴

I don't believe this is possible without hacking, but if you want to some examples on doing this are written here: http://www.codeproject.com/Articles/37912/Embedding-NET-Controls-to-NotifyIcon-Balloon-Toolt
I would advice you, if this is even possible, to move to WPF (or use a mix). For WPF there is a component which allows you to use custom popups. All the information on this can be found here: http://www.hardcodet.net/wpf-notifyicon

Notification in Windows Phone 8

Can I use All notification in single Windows Phone App (Tile , Toast and raw )? If yes then how ? Is there any example or link which uses all these three notification?
I have checked these links
http://msdn.microsoft.com/library/windows/apps/hh202967(v=vs.105).aspx
http://msdn.microsoft.com/library/windows/apps/hh202977(v=vs.105).aspx
and also what is different between Toast and raw notification.?
Thank You

Yes, you definitely can use all three types of push notifications. Why not? You just need to union the needed code from toast, tile and raw notifications articles. The code is pretty much the same except a few strings. You can merge it in one and you will get the app that uses all 3 types.
The difference between Toast and Raw is that when app receives Toast message - it shows a 'toast' (Top-aligned popup with app icon and some text above the accent color). As for wp8 - toast only shows itself when app is not active (not pretty sure about wp8.1). You can also check whether toast came to your app from code and do some more actions. As for Raw message - you just can subscribe to receive it and make some actions manually in your code - show MessageBox, refresh some data and whatever. So it seems to me that Toast notification is improved version of Raw notification.

Wp7 push notification to launch my app

As far as I know, Ios and Android gcm are able to open an application when a push notification event arrives.
For wp7, I only find samples on how to update tiles or display a message. But I need to display a bitmap in fullscreen.
Is there a way to open my app when I send a push notification ?
Thanks in advance for your help.

There is no way you can launch anything via a push notification on Windows Phone. Raw, toast and tile are the only acceptable types, none of which is able to invoke code execution outside the pre-defined boundaries (e.g. launch the app when the toast is tapped).
Since you are displaying an image, your best bet would be focusing on the tile updating mechanism. Remember, however, that there are no guarantees that the user will see the tile (unless pinned), or keep it on the home screen permanently.

If you send a Toast notification using the Notification mechanism, then tapping on the Toast will launch the application, you can then specify a page to navigate to within your application.
Take a look at the following for more information :
http://msdn.microsoft.com/en-us/library/hh202967(v=vs.92).aspx