How could a button with the WhatsApp number be added to this space in the image or replace the send message button with the WhatsApp button?
thanks 
Hi,
You can disable the Messages extension, which will hide the Send Message button. After that, you can create a vendor attribute using this doc How to add vendor profile fields - HivePress Help Center, but you need to use display format from this doc How to add a WhatsApp button - HivePress Help Center
I hope this is helpful to you.
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