LIBS- system is used to manage all billing and finance transaction of energy commodities (Gas, Electricity...) The main goal is to redevelop new billing system functionalities with a team of 20 other developers for Air Liquide Belgium, Germany and France. The main goals and usability of the billing system are : High degree of customization and calculation power New functions integrated, among others: Operational and commercial events Simulation tool Energy and market indices calculations High level of flexibility to automatically handle the invoicing of a large variety of complex contracts. Accrual revisions