anchor.diff:      Params = [{"metadata[nickname]", "PasswordParticipant"},
                 {"name", Uid},
                 {"credential", "pwd"}],
  -    {struct,[{"result", {struct, [{"id", Id},
  +    {struct,[{"result", {struct, [{"uid", Id},
                                     {"sid",Sid}]}}]} = tests_utils:post(BaseUrl, "/presence/", Params),
   
       ParamsDelete = [{"uid", Id},
  
positive.code:     Params = [{"metadata[nickname]", "PasswordParticipant"},
                {"name", "participant.user@af83.com"},
                {"credential", "pwd"}],
      {struct,[{"result", {struct, [{"id", Id},
                                    {"sid",Sid}]}}]} = tests_utils:post(BaseUrl, "/presence/", Params),
  
      ParamsDelete = [{"uid", Id},
  
negative.code:     Params = [{"name", "participant.user@af83.com"},
                {"timeout", integer_to_list(DefaultTimeout)},
                {"credential", "pwd"}],
      {struct,[{"result", {struct, [{"uid", Uid},
                                    {"sid",Sid}]}}]} =
          tests_utils:post(BaseUrl, "/presence/", Params),
      timer:sleep(DefaultTimeout * 2000),
  