WhatsApp 24-hour window
The WhatsApp 24-hour window is the time after a customer's last message or call in which a business may reply with any message, not just a template.
What it means
Also called customer service window, 24-hour rule.
Each new message or call from the customer restarts it. After it closes, only an approved template message can reach them, and Meta refuses free-text replies with error 131047.
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