To enable Facebook authentication, you need to retrieve your application credentials:
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Go to Facebook for developers website, click on "Add a new app" or select an existing app.
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On the list of available products search for "Facebook Login" and click on the "Set Up" button.
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Select "Web" platform and paste the URL where your Corteza system is running.
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Go to "Settings" and then "Basic" in the left sidebar.
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Copy and paste both App ID and App Secret fields to Corteza Admin; app ID maps to client key, app secret maps to secret.