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---\ntitle: “Understanding Meta’s WhatsApp Business API Pricing”\ndescription: “How you are billed for WhatsApp conversations.”\n---\n\nMeta charges per 24-hour conversation window, not per message. There are 4 categories: Marketing, Utility, Authentication (OTPs), and Service (user-initiated). Marketing is the most expensive. OTP Edge passes these costs through with zero markup if you connect your own WABA.\n