code: func (w *Webhook) SendLinkCardMsg(msgs []LinkMsg) error {
  	return w.SendPayload(&Payload{
  		MsgType: "feedCard",
  		FeedCard: struct {
  			Links []LinkMsg `json:"links"`
  		}{
  			Links: msgs,
  		},
  	})
  }
docs: // SendLinkCardMsg 发送链接消息