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The pricing of WhatsApp Business API is based on some variable factors, including service providers and message volume, but generally follows a pay-per-message model. Charges are made for both session messages within 24 hours after customer interaction and template messages outside the 24-hour window to previous customers whom the business has already sent an approved message. Pricing will also vary according to the country of destination. Some providers charge extra for set-up, integration or ongoing support services. Businesses should compare options and assess their specific needs to determine the best pricing structure for their use case.