Pricing for the WhatsApp Business API is based on a model that is conversation based, so businesses are billed for every chat session with their customers. Businesses are charged for every 24-level chat session, based on whether the user/consumer initiated the contact ( is the first one to send a message) or the business did (the business sent the first message). The cost of messages ... https://www.xpectoitsolutions.com/whatsapp-business-api