As digital payment options grow, so does the size of the tip

New York

THE flat white coffee drink was US$4. A suggested tip was US$3.

The cashier at Café Grumpy, a New York City coffeehouse, swiped the credit card, then whirled the screen of her iPad sales device around to face the customer. "Add a tip," the screen commanded, listing three options: US$1, US$2 or US$3.