How can I build a Multi-Brand Chat Widget?
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The New Screen Theme supports the append a label to the URL and detect it in the theme method as outlined in the Multi-Brand Email Widget article. If you have not looked over this article please take some time to do so.
2) Detect the CNAME: If a custom domain is being used for each brand then you instead want to detect the domain and set the logo accordingly.
These examples focus on swapping out the logo depending on the brand loaded but you can extend the code to do a lot more like changing the styles to achieve a fully customized branded experience for your customers.