Application Server Keys
Application server keys are used to idenitfy your application server with a push service.
Codelab Message Sending
When you are going through our push codelab you can send a message below.
Subscription to Send To
Text to Send
Sending Messages from Your Server
This site is here to make it easy to get going with sending a push message, but it's obviously not helpful for sending push messages from your site.
To send push messages from your own server, use one of the libraries available here.