A coffee cart business earns money two ways: the daily line and the booked event. The line needs speed and the event needs paperwork. Many carts end up with one tool for each and a notebook to reconcile them. A coffee cart payment app should cover both from the same phone.
To accept cards at a coffee cart, you no longer need a countertop terminal and a power strip. A printed QR handles the line, and Tap to Pay on a compatible phone handles the customer who wants to tap. Payment setup takes a little time once, and then both work from the KadePay app.
A mobile coffee cart for weddings is usually priced by guest count or by drinks served, with a deposit to hold the date and the balance due about a week before. Put those terms in a short signed form, collect the deposit by link, and send the balance as a bill with reminders.
Small cafe payments follow the same pattern, plus repeat customers. Prepaid drink cards and coffee shop gift cards keep regulars coming back, and both live in the same record as your counter sales.