Customers are required to weigh in. While on the scale, the software is capturing the vehicles total weight and notes are being made about the load (material type, County of origin, etc.) The customer is required to leave their credit card and ID with the scale operator until the unloading process has been completed. They will then proceed back to the scale they started at and the empty weight is subtracted from the original weight to get the net weight of the materials disposed. This net weight is how the charge is applied. The scale will then use the credit card to pay for and complete the process.