Step 1: Log in to firebase.google.com, click on 'Go to Console' button and select your Firebase Project. In case you don't have a Firebase Project, please refer the article here.

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Step 2: Click on the gear icon to the top left and click on 'Project Settings' -> 'Service Accounts'.

Step 3: Click on 'Generate new private key' and upload the downloaded file on Apptile Dashboard.