Step 2: Click the Settings menu entry, followed by API access.
Step 3: Click the CHOOSE A PROJECT TO LINK button and agree with the terms of service.
Step 5: After clicking on Google Cloud Platform a new tab/window will open.
a) Click the CREATE SERVICE ACCOUNT button at the top of the Google Developers Console.
b) Provide a Service account name (Ex- App Name)
c) Click Select a role and choose Service Accounts > Service Account User.
d) Check the Furnish a new private key checkbox.
e) Make sure JSON is selected as the Key type.
f) Click SAVE to close the dialog
g) Make a note of the file name of the JSON file downloaded to your computer. (Upload this file in the portal)
Step 6: Back on the Google Play Console, click DONE to close the dialog.
Step 7: Click on Grant Access for the newly added service account.
Step 8: Choose Admin from the Role.
Step 9: Click INVITE USER AND SEND INVITATION to close the dialog.