Operacion: Download child client invoices as Excel.
Bearer token authentication
Parent client ID (UUID)
"123e4567-e89b-12d3-a456-426614174000"
Child client ID (UUID). Omit for direct subscriptions.
"123e4567-e89b-12d3-a456-426614174001"
Period in YYYY-MM format
"2026-02"
Excel file download