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The interface is implemented on both sides by solution providers: the bid client (active) and the tendering platform (passive). Communication between client and platform is always initiated by the client. The client uses one of the provided web service operations to send messages to the platform. The platform processes these messages and creates responses directed at the client. Since the communication is unidirectional, the client has to retrieve the messages directed at it, similar to using a mail client to retrieve mail from mail server.
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