from 7 days to 14 days • You can check the status of a narrowcast message using the Get narrowcast message status endpoint, after making a send request. • The period during which you can get this "narrowcast message status" has now been extended.
alias • Delete rich menu alias • Update rich menu alias • Get rich menu alias information • Get list of rich menu alias https://developers.line.biz/en/news/2021/06/21/switch-between-multiple-rich-menus/
Postback 事件的形式向 Bot 應⽤程式發送 Webhook • LINE Server 接受請求後並將 Rich Menu 切換到使⽤者欲使⽤ 的樣式 https://developers.line.biz/en/news/2021/06/21/switch-between-multiple-rich-menus/