You can not. The Windows Notification Service Terms of Service clearly states
4.6 Your application must meet the requirements of the Windows Push Notification Service (WNS) if it uses WNS notifications. If your application uses the Windows Push Notification Service (WNS) to send push notifications, this should do it as described in this requirement. a) You can only use WNS for applications distributed through the Windows Store. Provided notifications via WNS are considered application content and are subject to all Windows Store application policies, including certification requirements. b) Your application must be associated with only one package security identifier. c) You may not hide or attempt to mask the source of any WNS message or packet security identifier or other unique direction identifier. d) You may not include in the notice any information that the client is reasonably considered confidential or sensitive. e) Your application should not use excessive network bandwidth or WNS bandwidth, otherwise the burden of a Windows system with WNS notifications is unjustified. For example, using WNS to stream content or transfer files violates this requirement.
This is very annoying for those of us who are trying to create Line-Of-Business apps that won't go through the Store.
For non-store apps, you can use the Windows Azure Service Bus instead, but then again, there is currently no support for the Windows Store apps ( someone, please prove to me that I'm wrong ). There is support for the .NET framework 4.5, java, python, and even PHP ... but not .NET Core.
Jon b source share