Hello,
I'd like to suggest a non-mobile push using a external API. Idea would be something along the following:
Admin API
configurePushURL(string restfulAPI);
You could then submit push notifications that will result in restful API calls to the url provided. This could use a predefined API or allow for arguments to build up the url and parameters being submitted.
The possibilities with this and cloudscript are endless and one of the features that come to mind instantly is private message without constant polling against playfab to find new messages.