In-person mobile payments are gonna be big, remote mobile payments even bigger.

Mike Isaac for the NYT:

Mobile-based payments in the United States are expected to reach $142 billion in volume in 2019, according to a report from the research firm Forrester, from about $50 billion currently. In the study, which will be released on Monday morning, the firm spoke to a dozen payments industry companies, including PayPal, Verifone and Visa. They indicated that the shift to mobile commerce was growing quickly.

U.S. Mobile Payments Market to Boom by 2019, Research Firm Says | NYT

Dig deeper and you'll see that by 2019, in-person mobile payments are expected to hit $34 billion, while remote purchases (via apps and websites) are expected to reach $91 billion. The latter helping to explain how important Touch ID iPads with NFC chips on board are for Apple:

Teardowns of Apple’s new iPad Air 2 revealed an NFC chip that wasn’t officially announced by Apple, but sources close to the situation have confirmed it’s only being used as a Secure Element for Apple Pay in-app purchases.

Apple describes the Secure Element on its website, which is used to securely store account numbers associated with credit cards for Apple Pay on both the iPad Air 2 and iPad mini 3, according to our source: With Apple Pay, instead of using your actual credit and debit card numbers when you add your card to Passbook, a unique Device Account Number is assigned, encrypted, and securely stored in the Secure Element, a dedicated chip in iPhone. These numbers are never stored on Apple servers. And when you make a purchase, the Device Account Number, along with a transaction-specific dynamic security code, is used to process your payment. So your actual credit or debit card numbers are never shared by Apple with merchants or transmitted with payment.

Source: NFC chip in new iPads just the Secure Element for Apple Pay | 9to5Mac