To only show the WhatsApp icon part of the widget, and link directly into your chat, follow this guide.
The existing code from the WhatsApp widget generator won’t be relevant anymore. The only thing you need is your WhatsApp link, and a piece of code as seen below.
Go to the WhatsApp link generator and generate your link.
It should look something like this:
<https://wa.me/YOURPHONE?text=YOURTEXT>
Open theme editor
Online store > Themes > ... > Edit code
Create a bubble.liquid snippet
Scroll in the left bar down to snippet > Add a new snippet.
Call it bubble(.liquid)
.
Copy the following code: