This app was mentioned in 2 comments, with an average of 1.00 upvote
Could look into things such as:
https://play.google.com/store/apps/details?id=de.bitsharesmunich.blockpay&hl=en
.... I have no idea how many of those only work for online stores, and how many are also for physical locations. But they're somewhere to start looking. :)
try blockpay so you don't have to pay anything: https://play.google.com/store/apps/details?id=de.bitsharesmunich.blockpay