Tracking for imagemap in webhook

I'm designing a chatbot with messaging api. There's a qustion: We can't identify incoming message in webhook is sending from a imagemap or from the user input when they are the same text. They're all message event and have the same payload.

What we want to do is when user tab imagemap, send him message A, when user type something, send the default welcome message.

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@Koki Thanks. It says 'When a user taps one of these areas, you can redirect them to a webpage or send a message on their behalf.' It still can't identify the message is come from Imagemap tapping or from a user input in webhook request payload.

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Are you sure? question.vm