You may already have an application for Windows Phone 7/8 that uses Push Notification and now you want to extend that to your Windows 8 app. Good News!!! Azure Mobile Services provide the functionality to enable you to do this.
You can generate images dynamically if you so desire. But you can also use HTTP Request module from within the mobile service and invoke a web API service to generate the image.
You may have the need to send tile notifications on a specific schedule. This can be accomplished either via data triggers or with the Windows Azure Mobile Services Scheduler. The scheduler will allow you to execute scripts on a given schedule.
Azure Mobile Service provides SDK for both Windows 8 and Windows Phone 8. You can find several tutorials specific for each platform click on the link below.
If you want to experiment with the sample code included, here are resources you will need.
If you want to do the same for Windows Phone 8
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