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WhatsApp has this eligiblity rule that businesses can only reply back to a customer within 24hrs of a customer's messages. As an alternative, you can send a template message when this happens.
In this case you may have multiple numbers with us and you want to specify from which number to send messages. Otherwise, our backend will choose one at random which may not be the one you are thinking of. E.g. you need to add the following to your request: