拒绝入群申请

String groupID = "group_123";
String applicantUserID = "user_applicant";
String handleMsg = "当前群人数已达上限，暂不接收新成员";

OpenIMClient.getInstance().groupManager.refuseGroupApplication(
    new OnBase<String>() {
        @Override
        public void onSuccess(String data) {
            // 拒绝入群申请成功
        }

        @Override
        public void onError(int code, String error) {
            // 处理操作失败
        }
    },
    groupID,
    applicantUserID,
    handleMsg
);