API endpoint to check the type of account - regular or master/sub-account

This is for developer-specific feature requests. For other requests please contact our customer support team.

Is your feature request related to a problem? Please describe.
There is no clear way to distinguish if an account is a regular or master/sub-account via any of the API endpoints. My use case involves users of both types of accounts using the app. So I need to check this first, to develop the workflow accordingly (e.g accessing Get plan usage endpoint with the right parameters)

Describe the solution you’d like
A field that indicates whether the account is regular or master account

Describe alternatives you’ve considered
Hitting the /accounts endpoint, and checking if we can access it.
Comparing the accountID of the users from the Get User endpoint, and checking if they are unique.