Step 1: Click on the service account created.
Step 2: Inside your service account, click on the “KEYS” tab. Press the “ADD KEY” button and select “Create new key”
Step 3: Select JSON format for the key type, the key will be downloaded to your DOWNLOADS folder. The file name will be similar to your project id.
Step 4: Open the downloaded JSON file (I have used notepad). The following fields from the JSON are required to create a connection.
Private_key
Private_key_id
Client_id
Client_email