First stop, this shave ice cafe, which I'm pretty much obsessed with. Here, Jenn authorizes her credit card with her fingerprint.
Step 2 in Korea is that the cashier holds it up to his payment console.
And Step 3 is that Jenn, whose personal account this is, has to sign. It isn't as fast as Samsung Pay in the US, but them's the local rules.
Next, Jenn went through the motions of buying something online, and picking Samsung Pay to fund it -- instead of a Visa or MasterCard, or PayPal, for example. This could save you time by verifying with your fingerprint instead of typing all your credit card credentials into a new site.
Here's a neat trick: In Korea, you can start an ATM deposit or withdrawal before you get there.
Select the amount from the app (Korea's local currency is won)...
...and then place the phone on the pad at the ATM to finish up and quickly get your cash or make your deposit.
Samsung Pay also holds public transportation credentials, so a quick tap of the phone on the card reader moves Jenn along.
The same goes for a Samsung smartwatch equipped with Pay, which looked dead easy.