Speaking at the Wall Street Journal’s WSJD Live conference today, Apple chief executive Tim Cook said that the company had activated 1 million credit cards with Apple Pay in the service’s first three days of availability.

That makes Apple the number one provider of contactless payments, Cook claimed.

“And we’ve only been at it a week. I feel fantastic,” he said, according to a report on the Verge.

Apple Pay is the company’s contactless payment system for the iPhone 6, 6 Plus, and the previous generation of iPhone 5 and 5S. It will also work with the upcoming Apple Watch, due out early this year. Apple Pay uses Near Field Communications (NFC), the same technology used by Google Wallet and some other contactless payment systems. It launched on October 20.

Cook said the secret to success in mobile payments was in making them “easy, private, and secure.” That echoes VentureBeat reviewer Devindra Hardawar’s comment that Apple Pay is “fast, easy, and boring.”

By contrast, Cook, said, credit cards are “a pain in the butt.”