I come in, open yesterday's mail (all invoices, of course).. stamp them, throw them in a pile to be matched with its backup and then proceed to check my e-mail.
After sorting through e-mail, I grab an invoice and start auditing it. I have to find the rate that matches with the charge and check that off. If there's problems with a charge, I have to contact the manager responsible for that transaction. I have to send a memo in order to get approval to pay. Sometimes the reply takes hours, sometimes days. It just sits there until it gets approved. If they deny it, I have to call the company that invoiced us and try to reason with them. If all fails, I have to ask the Controller to review it and they decide what will be paid, if anything.
Then I go on to the next one and do the same thing again. And cross my fingers there's no problems.
Then I eat lunch.. my favorite part of the day.
And on to more invoices. On any given day, this will change--sometimes I review the rates, make sure none have expired. Other days, I update my contact list or make 'cheat sheet' for myself.
I hope that helps someone.