Samsung Pay doesn't launch in the U.S. for another four days, but it's already a big hit in South Korea.

One month after launching in Samsung's home country, the new mobile payment solution has already processed more than $30 million in South Korea, Samsung said on Thursday. That covers more than 1.5 million transactions to date, approximately 60 percent of which took place on the Galaxy Note 5.

About 36 percent of people who have tried Samsung Pay are considered "active" users, with about 10 percent using it daily, Samsung said.

"Although the details on Samsung Pay usage are constantly being updated, the response we've received so far has been beyond our expectations," Injong Rhee, executive vice president of Samsung Electronics and global head of Samsung Pay, said in a statement. "We knew Samsung Pay would be a game-changer in the mobile payments industry and now with the user data, we are seeing the greater impact it is having on consumer behavior and on the lifestyle of our customers."

Samsung Pay is scheduled to launch in the U.S. on Sept. 28 followed by the U.K., Spain, and China sometime "soon." The service is currently available on the Galaxy S6, S6 Edge, S6 Edge+, and Note 5 devices.

For the uninitiated, Samsung Pay offers tap-to-pay functionality and is compatible with thousands of payment systems worldwide using a combination of NFC and magnetic stripe transmission. PCMag's Sascha Segan got a Samsung Pay demo last month and explained that "you swipe up from the lock screen to reveal your card, verify yourself using the fingerprint scanner, and tap the phone to the card reader."

The service goes up against Android Pay, which launched earlier this month, and Apple Pay, which arrived last fall with iOS 8.1.