Thank you!
Thank you!
Use your eyes?
Seriously though, you're asking for someone to take time out of their day and you put no effort into your question. From an external bot? From a Lua framework? Any info at all?
WoWAPI
event: "CHAT_MSG_WHISPER"
argument6: DND or GM
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if this option does not fit, you can use memory reading, the site is full of examples of using WoWChatParser (Chat reader)
And then you will need to filter out all messages except those where there is a blizzar icon