new_contents: import requests
  
  url = 'https://fcm.googleapis.com/fcm/send'
  headers = {'Content-Type': 'application/json',
             'Authorization': 'key=AIza...(copy code here)...'}
  
  payload = """ 
  {
    "to": "/topics/all",
    "notification": {
      "title": "Hello world",
      "body": "You are beautiful"
    }
  }
  """ 
  resp = requests.post(url, headers=headers, data=payload)
  print(resp)
  print(resp.text)
subject: Add example of sending push notification via Firebase Cloud Messaging