i'm certain that myself, along with a few co-workers, will use this capability pretty much every single day..
also, within my family, i think we'll use it often.
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every day at lunch..
either talk the server into giving separate checks then everybody pays individually..
or
everybody adds their share of the cash into the pot.. (never happens)
or
everybody with cash pays the person without cash who then pays the bill on a card
or
go to the bar to get change so everybody can cash out properly ("oh.. i only have twenties" -- times 5).. give cash to the one person with no cash.. (this last one is the way it usually plays out)
or
IOUs
etcetc.
with peer to peer apple pay.. this process becomes so much easier..
everybody just texts their portion to the one person who then pays the bill..
i'm not exaggerating-- the above scenario is a daily occurrence for me