Install the widget with one line
Each widget you add gets its own script tag, so settings you change in the dashboard reach your site without touching the code again.
The script tag contains nothing but the widget's public key. Colors, branding, and behavior are read from the server when the widget loads, so changing them in the dashboard reaches your site on the next page load with no redeploy on your side. The dashboard shows that one snippet and nothing else, so there is no second copy of your settings sitting in your source to keep in sync by hand.
You add a website, style the widget with theme, position, and colors, and watch a live preview of the button update as you change them. Advanced styling options are marked as paid and shown locked rather than hidden, so you can see what a plan would give you before deciding whether you want it.