Before creating a scan referral, you first need to create a user.
    This request uses basic authentication with your client_id and client_secret.
    It returns an access token that can be used to access all other endpoints that are not using basic authentication.
    The access_token expires after a certain amount of time.
    Usually one day but we can configure a different period of time for you.
    This request also returns a refresh_token that can be used to request a new access_token before its expiration.
    See the "Request a refreshed Access Token" request.