I have built few apps successfully using Ionic 2 now. But I never used Ionic services in any of the apps.
I have gone through the documentation and it seems it will save a lot of time if I use Ionic services mostly package and authentication.
One thing that is keeping me off these services is Authentication
Ionic auth looks cool as it takes care of everything, but I have few doubts.
Now we mostly try keeping our database common for our apps and websites both.
Consider my backend is Firebase or Drupal (Just because I have used this till now)
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To perform some crud operations, I will have to authenticate my app users with firebase/drupal.
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Now, How am I suppose to sync these Ionic users and their authentication with my backend like firebase/Drupal?
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Point is to keep all data/user data common accross all platforms.
Point me in the right direction if anyone can 
Links to related articles/blog posts would be helpful ! Thanks