WhatsApp Booking Button Integration

I want visitors to move from browsing to booking in one tap. The site is not already live only webpage is ready; what’s missing is a floating button that stays visible as they scroll and, when clicked, opens a WhatsApp chat with me. The chat should automatically populate with the specific service or booking type the visitor just chose so they don’t need to re-explain what they want.

You’ll handle the full front-end integration—styling the floating button so it matches my site, wiring it to a wa.me or WhatsApp API link, and pulling the selected service name into the pre-filled message. I’ll supply access to the codebase and the list of service labels. Give me back a clean, commented snippet (HTML/CSS/JS or the framework I’m using) plus quick setup instructions so I can drop it straight into production. Once installed, I’ll test on desktop and mobile; if the button floats smoothly and the pre-filled message shows the correct service every time, the job is done.