title: Send message from webserver to mobile chat app (like WhatsApp, Viber or Kik) on my smartphone?
body: <p>I would like to send notifications from my webserver to my smartphone, preferably through one of the popular mobile chat apps like WhatsApp, Viber or Kik. </p>
  
  <p>Is there any known documentation or API or something, that describes how to send a message to these clients, for example using PHP?</p>
  
  <p>Note that I only need to be able to send notifications to <em>my own</em> smartphone, so requiring specific info to identify my particular client (like cellphone number or something) is fine.</p>