In transportation, “payable” refers to the amount of money owed by a shipper or customer to the truck owner or transportation service provider for services rendered. When a trip (shipment) is completed, the service provider will prepare an invoice or bill that details the services provided, the quantity or weight of goods transported, and any additional fees or charges incurred during the transportation process. The shipper or customer is responsible for verifying the invoice and making payment in a timely manner.