Hi,
Is there an API to check if a WhatsApp account exists before trying to send a message?
or example if you open a link like https://wa.me/38970345678 the WhatsApp app will show an error saying "The phone number +389 70 345 678" isn't on WhatsApp."
WhatsApp Web will give you a different error but it is basically the same: "Phone number share via URL is invalid."

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