I want to send whatsapp message from a web page without opening the whatsapp web chat box. I know there are API's which are provided by twillio and chat-api for this functionality, but they have a pricing for that. I have seen many web applications which allows users to send whatsapp messages from their own applications without routing it to whatsapp web and that to after you register for their trial version for free. So how do they actually do this and manage to allow users to send whatsapp messages without costing them at all.
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