When collecting revenue from machines, more often than not they need to be serviced. The servicing process is split into two parts, the call from the customer and the action (if any) to be taken. The actions can be simple refunds or complex work orders.
Calls This expense can be included in the deal. For example, a deal can be structured whereby service calls are deducted from the revenue collected for that period. Alternately, the customers end of the split could be used to reduce the outstanding expense associated with the location.
Refunds Some calls will be for refunds only and don't need a work order since nothing physical done. See the refund section for more details.