Licensing guide - OfficeDev/microsoft-teams-apps-classroom-dropin GitHub Wiki

Customers can get access to Microsoft Power Apps by purchasing standalone licensing or though seeded licensing of Office 365 and Dynamics 365 Applications.
Classroom Drop-in app uses HTTP actions for calling various Graph APIs. To achieve this, license which support premium connectors is required.
For this application, it is recommended to use "Power Apps per app" plan.

• Power Apps per app plan allows individual users to run 2 custom applications (be it canvas or model or both) and access 1 custom portal based on the full capabilities of Power Apps.
• Embedded canvas apps within a model-driven app will not count towards the two-app limit.
• Once a pool of Power Apps per app licenses are purchased, individual licenses need to be assigned to specific environments and to individual users (i.e. if the same app exists in two environments, a user would require two per app SLs to access both).
• The Power Apps Per App plan is available to education customers under faculty and student pricing. Since these licenses are sold as tenant level capacity and not assigned to users in active directory, customers and partners will be responsible for ensuring that student pricing is only being applied to students. This means that when licenses are purchased with student pricing, the number of app licenses assigned to non-students (i.e. faculty) in the product may not exceed the number of faculty licenses purchased as this would indicate that student licenses have been assigned to faculty.
• Price: $10 per user/app/month

Note: Price may vary depending on tenant type, reseller, and customer agreements with Microsoft.