> start a conversation through WhatsApp automatically once the user clicks a button on a website You can have a button that takes people to whatsapp web/app depending on device, but bots can't message users first. This is a WhatsApp anti-spam rule, not a Botpress thing. > start a conversation automatically through el WhatsApp once an user leaves it's phone number on a website form Also restricted by WhatsApp. Once a user opts-in to messages, you can send them messages as replies, or a single followup message within 24 hours IIRC. Check out https://faq.whatsapp.com/868507767645966/?helpref=hc_fnav for more info