An Arduino program to send a push notification message to an Android application through Google Cloud Messaging (GCM) service. -- 2

We need a program for the Arduino and Wi-Fi shield for a doorbell. When the doorbell is pressed, the Arduino attached with the Wi-Fi shield will send a push notification message to Android phone through Google Cloud messaging (GCM) service. We made the Android Application but am having problems with the programof the Arduino and Wi-Fi shield. If interested, please contact me.