My user wants to access personal content from her Spotify, Soundcloud and other third-party accounts through one native mobile application. Imagine a music player for any personal library.
The challenge I face is having our user link all of her accounts. Some may be linked using a Facebook login while others may not. What might a simple authentication process flow like? What's the best interface for 'linking' multiple accounts, especially if they all are accessed through different email/password combinations?
Keep in mind this flow would be for both a native Android and iOS application.