This is the E-Mail address associated with the service account credential in the
Google Developer Console.
To create a new service account:
- Select your project from the Project list.
- Navigate to "APIs & Auth" and then "Credentials"
- Click the "Create new Client ID" button
- Select "Service account" and click "Create Client ID".
- A dialog should pop-up to download the private key file for the new service account, save this in a secure
location. This file contains a Private key in json format.
- After clicking, "Okay, got it", you should see a "Service Account" section and a Email address field; This is
the E-Mail address you must input here.