How to Send App request to facebook friends through facebook iOS sdk?

Here is the fix: Go to developers.facebook.com. Edit your app settings. Check 'App on Facebook' and 'Native iOS App'.

Enter web-site URL of your app (if you have) as the Canvas URL (Secure Canvas URL can be the same). Enter iOS Bundle ID and iPhone/iPad App Store ID (You can find this info on your App page at iTunes connect). Canvas URL is used to redirect your friend if he reviews the request from Web-site iOS Bundle ID and iPhone/iPad App Store ID are used to redirect your friend to App Store if he reviews the request from Native iOS App.

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