When ON, every online order automatically gets this percent off all food items (the delivery fee is never discounted). A banner with your campaign name is shown at the top of the ordering page, and the discount appears in the customer's cart, on their card payment, on the kitchen receipt and in your Sales numbers. Changes go live within about 30 seconds — no deploy needed.

Tip: write the name in both languages, e.g. “Summer discount · Sommarrabatt”, since it is shown as-is to every customer.