What is the difference between App ID and API Key?





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I have previously raised a query for the PHP SDK on this (as I see that in the source code of PHP SDK, appID used at places where 'api_key' is expected). Nshah has replied me that this is because appId is faster and can be used anywhere apiKey is expected. (For details, see

I think this is probably because Facebook is now using OAuth where we can use the appID as the OAuth client_id.



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