A: Hi,

To clarify, in-app authentication is a special feature for a special use-case. Even Tier-1 is available for unlimited learners. Regarding in-app authentication, here is the article: https://intercom.help/mini-course-generator/en/articles/9403804-enable-access-with-in-app-authentication?location=conversation

Per year means unique users / per year.

Let us know if you have any further questions