Get Open Rate For Subscriber Bulk Broadcast of Messenger BroadCaster
If you are sendig message with Subscriber Bulk Broadcast of Messenger BroadCaster, to enable the report of open rate,
Make sure to edit the webhook event of your app & select message_reads .
Goto you Facebook APP, From Left Menu click on Messenger -> Settings .
After that disable the BOT, & Re-start the BOT again. ( Don't Delete )
This settings is need...