How can I modify this to get permissions for offline_access and others
"https://graph.facebook.com/oauth/access_token?grant_type=client_credentials&client_id="+appId+"&client_secret=" + appSecret;
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1 Answers
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I don't think you can. The url you are using looks like the one used to get an access token for adminstrative actions on behalf of an app. I.e. Graph api calls requiring an app access token such as access to app Insights.
Offline access, as far as I know, applies only to performing actions on behalf of a user e.g. posting to their wall.
Maybe you are looking for something more like this?
https://www.facebook.com/dialog/oauth? client_id=YOUR_APP_ID&redirect_uri=YOUR_URL&scope=offline_access,email,read_stream,etc
Assuming you have already know about the authentication guide, but just in case:
