Nope. You are only able to see which customer dealt with which agent before but their messages conversation.
Yes, you will be able to see which page they stopped at last before they click to chat with you.
Yes, this will straight link to your WhatsApp™ and you may chat as normal with your potential leads.
It would be preferred that you do have website/landing page to showcase listed WhatsApp™ number. You can simple send a link or display QR code generate from system to let customer chat with your livechat.
You can list 1 WhatsApp™ number for free forever till unlimited WhatsApp™ number. You can check the features here
You will be able to set the time availability for booking, buffer time in between slots and number of booking allowed per slot. Your customer and you will get appointment confirmation and reminder via WhatsApp™.