public override async Task <IResponseMessageBase> OnEvent_SubscribeRequestAsync(RequestMessageEvent_Subscribe requestMessage)
            {
                var message = await _wxManager.GetMessageAsync(_wxAccount.SiteId, _wxAccount.MpReplyBeAddedMessageId);

                if (message != null)
                {
                    await _wxManager.CustomSendAsync(_wxAccount.MpAppId, requestMessage.FromUserName, message);
                }

                return(new SuccessResponseMessage());
            }