Platforms of digital democracy, including both those in platforms of e-government and those operating independently, provide a channel of citizen participation enabling democratic decision-making processes. This paper presents a proposal for an e-democracy platform based on web services technology that is configurable and extensible for use in different scenarios of citizen participation. Operations that this platform must provide to applications are provided, and its breakdown in web services, with the use of service orchestration techniques to define plans for controlling the execution of services in the proper order.