Originally Posted by
diburning
Oddly, while I am aware that Discover will process over Diner's (and JCB and UnionPay) I've tried it at many places outside of the US where they claim to accept diners and it didn't work. I didn't recall seeing the Diner's logo at the supermarket chains in Australia, which was why I was surprised. Now that I know for next time, I'll use my Discover there!
That's very weird. I actually have never used my card outside the US, so I don't have any experience with that myself. But it would be annoying to find a place that's supposed to take the card and not be able to!