For your app to call SDO APIs, it need to be registered on SDO API Gateway. This is your App Name which would registered on SDO API Gateway. App Name should have a prefix for your team. This would help easily recognize it among other apps.
Callback URL
Callback URL used by OAuth 2.0 authorization servers to communicate authorization codes back to your app. This is optional.
Notes
App notes describes the app registered on the API Gateway.
API Products
API product is a set of one or more proxies/microservices that are bundled together for the App (front-end/b2b) to consume. You must have at least one API Product to create your App on SDO API Gateway.