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I did message testing of my server running Nodejs for Whatsapp using the Wbm library (Wbm is an unofficial API to send Bulk messages in Whatsapp), but I understand that is not the right way, so I am resorting to experienced developers.
The correct way to integrate an APP with Whatsapp in order to send messages would be via Facebook partner channel or is there an option to access API for this?
In my view it would be using Whatsapp business. But I have no experience with it. One of the differentials is that it facilitates some tasks related to user interaction via response automation.
– Danizavtz