If it's the one that I usually do, the reimbursement is $16 and you do not have to order a roll. You do have to order a single item and allow them to upsell it to a combo. If they don't, you have to order the combo anyway. Here's what we did:
10 reg. wings, 1 drink, 1 reg. fries, 1 ranch dressing, 1 lb. potato salad, 2 rolls.............total $16.20 including tax.