title: FCM Limitation for Android Push Notification?
body: <p>We are migrating from GCM to FCM in one of our projects.
  One of our clients asked us "Like GCM has 100 notification limit" Do we have any limitation for FCM.</p>
  
  <p>Can we use the same sender-id and key for multiple environments like Dev/QA/UAT and also production?</p>
  
  <p>Thanks in advance</p>