I keep 3 forms of payment on me for this reason. Phone, card, cash, in that order.
Edit: Within 30 minutes of making this comment, I was at a Walmart. No NFC payment. The machine didn't like my card. Now I have 2 quarters and a penny in my pocket.
The register's down sir, we can only accept payment in the form of interpretive dance convincingly communicating your burning desire for the chosen products.
Tips in the form of jazz hands are always appreciated, but never expected.
As many as you’d like, depending on several constraints which include how long it takes for someone to stop you, how many you can carry, and how fast they are able to produce cheeseburgers.
That's a Walmart thing. They wanted to compete with Apple over contactless payments thing and Walmart invested in tech that uses QR codes. No one ever partnered with Walmart so they now use their QR payment tech in house.