I'll frame this question in a general way so it applies to other 3rd party app developers, not just me:

What level of API integration are NB customers asking for?

For example, if you build a third-party app that can help members of a nation interact with each other (i.e. group chat or something else), there are several ways I can imagine that you'd want to integrate it with NB, each with a different level of complexity:

• No integration: Just listing an app in the app directory, essentially as an ad for the app-- probably not an option.
• Minimal integration: Include the app in an iframe and have either no sign-in requirement or require that the members of the nation sign in a second time within the app's iframe as part of the app's authentication process.
• Deep integration: Connect to the People API so that members of a nation can sign into your app from within a NB page for that nation.
• Other options?

Are any of those options emerging as common or recommended?  

What are NB customer expectations around 3rd party app integration?  I don't expect they'd be too happy with requiring that the members of their nation sign in twice-- once to NB and once to the app.  That's what I found with one client I worked with.

Thanks!