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It was one of the smaller POS devices. After she hit the back button on screen it turned to a white background with black text and in between two black lines was a sentence that I think say pay or accept bitcoin with a small black arrow. She pushed that and the QR code came right up
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I'd love to find a video of the what she clicked (I.e where she went back to, and what the menu looked like) so I could use it to show other square merchants where they might find the same option.