I already have a menu hosted on my restaurant’s website, but I now need it re-worked so customers can place an order that is instantly compiled into a pre-filled WhatsApp message and sent to my number. The flow should be seamless: customer browses the online menu, selects items and quantities, taps “Order”, and their cart details are pushed to WhatsApp—no further back-end confirmations are required on WhatsApp at this stage, just the outgoing message. Alongside the web menu update, I need two printable formats generated automatically from the same order data: • 58 mm thermal receipt layout – optimised for common POS thermal printers, with proper line wrapping, item totals, GST breakup and a crisp logo header. • GST-compliant PDF invoice – A4 size, containing only the basic item details and prices, subtotal, GST percentage and grand total. Deliverables 1. Responsive web menu (HTML/CSS/JS or a lightweight framework) connected to my existing site. 2. WhatsApp “Send Order” integration that opens the WhatsApp chat with the structured order text. 3. Thermal receipt template (58 mm) ready to print via browser or POS utility. 4. Auto-generated PDF invoice meeting Indian GST format standards. 5. Brief deployment guide so I can maintain menu items myself. Acceptance criteria • Menu loads under 3 s on 4G, fully mobile friendly. • WhatsApp message matches the receipt and PDF totals exactly. • Thermal print shows no truncated text on 58 mm roll. • PDF passes a sample GST audit check (correct HSN, tax slabs and totals). If you have experience with WhatsApp deep links, thermal printer CSS, or PDF generation libraries such as jsPDF/PHP FPDF, your proposal will stand out. I’m ready to start as soon as you can show a quick demo or reference project.