Clamchatter,
What sandyf has described, or a similar method, will be very valuable to you in future. Having a record of the split between business expense (th price you paid for the food, in this case) and the fee portion of a lump sum/combo payment, of EACH payment, is the way to accumulate that the IRS could demand: "contemporaneous records" of expenses incurred in earning fees when the MSC pays a lump sum per shop.
Based in MD, near DC
Shopping from the Carolinas to New York
Have video cam; will travel
Poor customer service? Don't get mad; get video.