Just to make sure I understand your concern, do you want to fetch the legal entity name that you see against "
Who Pays" in the billing section of your AdWords web interface for your AdWords client account? You can do so with
CustomerService. The
Customer.CompanyName can return you the legal entity name for that AdWords client account. If you are looking to get more information about billing accounts, I would recommend checking out the documentation for
Budget Order Service. Please note that you would need to get your account white-listed for the same. Your Google Account Manager should be able to help you with that.