I don’t know much about the underlying tech, but some large retailers (Target sprints to mind) resisted adding contactless payments and push users to use their

I don’t know much about the underlying tech, but some large retailers (Target sprints to mind) resisted adding contactless payments and push users to use their own app. Some quick searching indicates they may have added support in 2018 or 2019. It sounds like Walmart still doesn’t support them.