Originally Posted by
RedLight2015
Which failed me in London Underground because of Visa wanting our contactless to be different than the rest of the world.
It's not. It's the same standard, just a lot of banks implement only a minimal feature set (and Visa encourages this, Mastercard discourages it, and American Express REQUIRES the full feature set is supported). It's the exact same in Canada... so it isn't just the US. I disagree with it, but it is what it is. One more reason Amex is best for travel.
Now, Japan, they use a different contactless standard. That's irritating.