I am integrating Onenote with my application. I am using MS Graph API's for getting data from Onenote. To consume the api's I am generating the token as mentioned at link get auth tokens.
I am registering my application at MS application registration portal. Do we need to purchase any kind of paid license to use services provided by MS graph API's.
The app registration process seems simple and doesn't differentiate between applications that can be used in production/test environment.