BSD A person is not believed to testify in court about himself, as testimony- in Halacha- has to be totally objective. But what about that person’s messenger/ representative/ shaliach? Can they testify about what they did on his behalf, or are they too considered as interested parties? E.g. If a dispute occurs regarding whether Kiddushin took place or not, can the person representing the mekadesh testify that the Kiddushin took place?