Not sure if anyone has seen this (apologize if it is somewere I missed). There is now a work a round to use Apple Pay at Walmart through the Ibotta app. The Ibotta app supports Apple Pay and has a new "Pay with Ibotta" feature. Get your stuff at Walmart. Go to checkout. Open Ibotta App. Choose Walmart. Then input the $ you owe. This will then purchase a "digital gift card" with your Apple Pay. Then scan the code at the self check out or tell the person to run as gift card and scan. There is no doubt this is way more cumbersome than simply using Apple Pay, but is a way to use Apple Pay and not your card at Walmart.
I’ve been using this through Ibotta since it released for the cash back. I save all of my cash back throughout the year to buy Christmas gifts at the end of the year. I always end up with $300-$500 for presents.