How to install and use Trigger Email Extension from Firebase?

This Extension composes and sends an email based on the content of a document that is written to a specified Cloud Firestore collection.

There a lot of cases in which we need to send information to our users via email. Fortunately, Firebase has created an Extension called Trigger Email, that can help us achieve exactly that. It’s really, really easy to install and use.

How does it work?
This extension will compose and send an email as soon as a new document is created into a selected collection in…