What is 24-hour customer service window?
On WhatsApp, the customer service window is the 24 hours after a customer's last message. Inside it a business can send free-form replies; outside it the business must use an approved template.
What it means for your business
The window restarts with every new customer message. Replies inside it are billed as service messages after the free monthly allowance.
Source: Meta for Developers, WhatsApp Business Platform pricing
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