Good spot! The store I visited is listed as accepting Apple Pay as well so the listing is wrong. Does anyone know where Apple Maps gets that info?
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I think there are a variety of ways:
1. Business owners update the information on the website Apple have somewhere (Maps Connect?)
2. From people using Apple Pay regularly in the store itself.
3. People (like me) visiting places contactless/Apple Pay is accepted and reporting it as a 'problem' within the Maps app itself; I've done a handful now and two-three working days later Apple update it accordingly.