I have a Facebook app ID which I’m using on 6 iOS apps for sharing posts on the user’s timeline using Single Sign-on (SSO).
I have setup the custom URL Scheme suffix described here and it’s working fine right now.
My question is regarding the “iPhone App Store ID” and “iPad App Store ID” fields listed on the Facebook app settings. From what I understood here, these IDs would only be used if the user started an action on the Facebook app that would required my app to be installed. It would then be redirected to the AppStore ID listed on those fields.
My question is: is this really what these fields are for? I’d rather not forward the user anywhere (leave this blank?) but it’s not allowed. Maybe I should just fill it with my app’s free version AppStore IDs?
If you fill in those values, users who have your Facebook app installed will see the icon for your iOS app appear in the applications sidebar within the native iOS Facebook app on their iPhone.
Tapping that icon will then either launch your native app (if it’s installed) or take them to the App Store page for that app so they can install it.
If you are using your Facebook app with multiple iOS apps, then you’ll either have to pick one of your native apps to be the native app that represents your Facebook app, or just leave the fields blank.
There is no way to associate multiple native apps with a single Facebook app AFAIK.