i am developing fb chat bot, and i want to mark the message as read so that when the moderator of our fb page view the message part, they won\'t see so many unread messages even
You can not mark message as read (as of now), but the best way I deal with this is to use Handover Protocol
Follow the instruction here to set it up: https://developers.facebook.com/docs/messenger-platform/handover-protocol/pass-thread-control
(Note: You can pass thread to page inbox and then take thread back immediately. I will notify to INBOX, but your bot can still work with users.)