After you create your OneRoster application, click "Request Sandbox Access" in the OneRoster section of the Dev Console to receive credentials for our developer Sandbox.
Before you can access data from a ClassLink Roster Server enabled district, you must create a OneRoster application. This gives districts the ability to quickly identify and provision access to your application. If you have multiple applications with different roster requirements, you may want to create an application for different rosters you need access to.
Districts will have the option to give you programmatic access to the class rosters via the REST API or upload OneRoster CSV files to you.
Create the application from Manage Applications in the developer console.
Make sure to upload a logo for your applications. Districts will see your logo when they provision access to your application.