We have over two thousand linked accounts under our MCC account. I'm trying to pull the current PPC billing amount due (not the "API costs", the current "Advertising costs"). Currently, I have to drill down to each account, select the "My Account" tab and then the "Billing Summary" sub-tab. With over 2,000 accounts, this will take a week. I'd like to do it through the API, but haven't been able to find a way. The InfoService has methods for getting quota used, but this has nothing to do with what I'm looking for (the advertising amount due).