A well-organized billing system is required to ensure every container movement is accurately accounted for. With the TOPO billing module, it stores the rates and charges for the yard as well as vessel operation activities. It also creates billable items based on the container handling and services that are provided in the terminal. The charges are consolidated periodically or by vessel, and then passed onto a third party financial system for invoicing and other financial processing, as the TOPO billing module does not include an invoicing or accounting system. However, the system is flexible and supports multiple currencies.