Design for the queue
Put the core menu, combos, and sold-out state above secondary information. Keep item names short enough to read outdoors and make prices obvious. Guests should understand the offer before reaching the window, even on a slow connection.
Place the code where waiting customers can scan
Use a large high-contrast print on the serving side, a smaller backup near the payment point, and the same link on event listings and social profiles. Test the physical sign from the real queue distance and in direct sun.
Use pickup ordering carefully
WhatsApp pickup can reduce repeated questions and let customers prepare an order, but staff must confirm when it is accepted and ready. Publish current hours and location in the surrounding channel because the menu URL alone may not tell a customer where the truck is today.
Keep a low-tech fallback
Outdoor events bring weak connectivity, damaged signs, and guests without a usable phone. Keep a concise printed menu visible and make sure the service can continue when the digital path is unavailable.