I for most of the stores/sites I shop at regularly, I already have their app. That would include Amazon, Target, Smith's (Kroger), Safeway, Walmart, Sam's Club.... etc.
So whether or not their app handles payments, I have the app anyway. For Walmart, it's not as hard as some here seem to imply. It's easy to get to Walmart Pay in the app, eliminates paper receipts, and very easy to load receipts into savings catcher. Before I even get to checkout I usually have already used the app to price scan an item, check reviews, or whatnot. So it's no big deal to use it to pay. I do have Apple Pay enabled on my iPhone as well as Apple Watch. Sure I like using it, but I won't make decisions about what store to shop at based on it.
Mike
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Wow. To each their own but to me that sounds like cutting face to spite nose.
Mike