title: Email notifications in firebase
body: <p>I would like to know if anyone knows a way where you can send an email when a specific node in firebase is created, updated or deleted?</p>
  
  <p>More specifically, I have a web service where users can book each other for a period of time. I use Firebase as the backend to store user information and so on but I want to send a confirmation to the users' email address whenever a booking has occurred. I understand that this has previously been possible using Zapier, however they no longer support Firebase.</p>
  
  <p>Anyone who has a workaround or an idea on how to send email notifications in Firebase?</p>