1 - Click Apps and then select your app.
2 - Click the Settings button on the left side of the screen.
3 - In the Basic settings,
click the Add Platform button below the settings configuration.
4 -Select Website in the platform dialog.
5 - Enter your URL (localhost
works here).
6 - In the App Domains text input, add your domain that
matches the one in the URL.
7 - Save your settings.
Check this link for detail
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