The PetrolPlus Dual cash register system is for petrol stations which are operated by two contractors (different seller of petrol and shop products). It supports a wide variety of e-products, such as e-vignette, e-toll, PaySafe, relational tickets and mobile balance top-up. Volume limits can be set per individual Customer or Customer Group. Scheduled price discounting can be applied with various conditions. The WPHeadOffice integration provides centralized management over multiple PetrolCashOnline systems even on different physical locations.