I'm creating an iOS application where I'd like to integrate Facebook Messenger for users to message each other. I've tried deeplinking via fb-messenger://user-thread/{user-id}, which works as intended. When I open the URL via my app, it switches over to Facebook Messenger. However, as this type of link seems undocumented by Facebook, I'd rather not risk using it as they might change it at any given time.
I've then looked into Facebook App Links, but as they're very few examples of how to actually use it, I'm not completely sure how to use it for a simple case of switching from my own app to messenger with a user-id as a parameter.
Any comments on this matter will be much appreciated.