pull down to refresh
on the chekout screen?
Edit: It might be that they have to enable on using their online dashboard, but I was pretty sure that I heard it was auto enabled.
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I also heard it was auto enabled but that some merchants are behind on their updates.
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We scrolled through the menu and sub-menus of other payment options. People have mentioned it being a little buried but I really think we would have found it if it were there.