public void RemovePartner([FromBody]string partnerId)
        {
            SecretUserId userId = UserIdExtractor.ReadSecretUserIdFromRequest(this.Request);
            using (TransmitContext context = new TransmitContext())
            {
                UserIdValidator validator = new UserIdValidator(context);
                validator.RequireSignedUserIdValid(userId);

                UserManager userManager = new UserManager(context);
                userManager.RemovePartner(userId.UserId, partnerId);
            }
        }