The basic idea is to create a service that will facilitate the management of the cash register of a building. It will provide an account or otherwise an e-wallet that will contain the money reserve in electronic form, billing and credit options. The user-administrator will be able to easily make electronic payments such as PPC, EYDAP, service payments, etc. but also to collect electronically from the tenants of the building the corresponding amounts.This service will provide the necessary management tools to the user-manager but also access to information to tenant users, as transparency of transactions will be a key element.