There is a simple way to solve this problem. A special startup can he inacted to solve this frequent problem. We'll not use any special card or ID. Showing ID

There is a simple way to solve this problem. A special startup can he inacted to solve this frequent problem. We'll not use any special card or ID. Showing ID for a burger seems invasive and special loyality card, we can forget to carry it. Blue accounts are loyal customers. Green ones are tourist/one timers. 1. Use colored money concept. 2. If a customer sends money from their mobile wallet more than X times, their account is colored for this particular merchant. If merchant has set a rule, if payment is > X times / Y dollars, then apply 50% discount for A duration/B payments. 3. Anyone not confirming with app, doesn't qualify for any discount. Cash + app will also be supported. Now simply adjust the prices to reach the demand you can keep up with.