You can continue to use URL schemes when you build your app for iOS 9 and you want to call URL schemes, you will now need to declare them in your apps Info.plist. There is a new key, LSApplicationQueriesSchemes, and here you will need to add the list of schemes you want to are canOpenURL on.
<key>LSApplicationQueriesSchemes</key>
<array>
<string>fbauth2</string>
</array>
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