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... (Budget: ₹100 - ₹400 INR, Jobs: API Integration, CSS, Frontend Development, HTML, JavaScript, PHP, Web Design, Web Development)