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Open up Google Developer Panel (https://console.developers.google.com).
Create a project, on Home there's #ID: That's your SenderID.
#ID
SenderID
Check API > Enabled APIs and enable Google Cloud Messaging for Android.
Google Cloud Messaging for Android
Go to API > Credentials, create a server API key 'XXXXX...' (39 chars).
server API key
App #ID goes in your mobile APP.
API key goes in rpush to send notifications.
rpush