I want to reward the regulars who order every week without giving everybody a discount. What is the tool?

Three fit, and they stack. Stamps under Marketing → Loyalty & stamps give a reward after a set number of orders, and only the people who reach it get it. An Every Nth order reward under Marketing → Offers gives something on, say, every fifth order. Cards people earn under Marketing → Gift cards writes a rule such as fifty days of ordering earns a fifty gift card, and the card arrives by itself with its code on WhatsApp. None of these touches the price for the customer who orders once. Restaurant rewards programs here are rules you write once, not codes you hand out.