In Singapore there’s a strict rule: if your insurance isn’t cashless, surgery won’t begin until you’ve paid the full amount upfront. And when the bill runs into tens of thousands of dollars, that’s not just money - it’s a matter of life and death.

Stack & Pay lets customers combine multiple payment methods — cards, wallets, UPI — to complete a single transaction, one slice at a time. It’s built for flexibility, high-value purchases, and real-world behavior.