I wanna let LINE Official Account sent greeting message as flex message first when added LINE Official Account as friend but the LINE Official Account Manager Tool support only plain text in first bubble.
Adding LINE bot as friend then user will receive greeting message as flex message first.
paste JSON code to greeting message but it exceed limit of character and perview box not showing as flex message but JSON code.
If you implement a bot server that receives webhook, you can send greeting message as flex message first in the situation. The corresponding webhook is a follow event: https://developers.line.biz/en/reference/messaging-api/#follow-event
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