title: What is the difference between of Firebase Cloud Messaging token and Server key?
body: <p><a href="https://i.stack.imgur.com/Vv9lJ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Vv9lJ.png" alt="enter image description here"></a></p>
  
  <p>Just wondering what is the difference of the credentials above? I tired using both which is working. Im using PHP backend API to send FCM notifications to targeted devices.</p>