notify.rb

require 'json'
require 'rest'
require 'date'

@notification_token = ""
@pushes = [
	''
]

# POST request -> logging in

data = {
  'registration_ids' => @pushes,
  'data' => {
    "type" => "ExternalURI",
    "message" => "You have been assigned a Mission nearby!",
    'collapse_key' => 'notification',
    'sound' => 'tornado-warning-siren.caf',
    'link' => 'http://google.com',
    "id" => 1
  }
}

headers = {
  'Authorization' => 'key=' + @notification_token,
  'Content-Type' => 'application/json'
}

rest = Rest::Client.new
resp = rest.post("https://android.googleapis.com/gcm/send", {:body => data.to_json, :headers => headers})

puts data.to_json
puts resp.body