The Apple Watch officially goes on sale today, bringing Apple Pay to the wrists of many consumers, but the device's competitors — a large number of increasingly sophisticated and far less expensive wearables — are also attracting the attention of Apple Pay issuers.

The Starbucks mobile app is now used for eight million transactions per week, or 19% of the company's U.S. sales, but the biggest development is not in the numbers but the nature of the app's users.

Citigroup and AT&T have unveiled a new credit card that offers a credit for a new smartphone, potentially boosting adoption of Citi Wallet.

Increasingly, the goal of more payments providers — from megabanks like Wells Fargo to startups like YoYo — is to hide the fact that they are payments providers.

PayPal is investing heavily in technology to make sure it is properly equipped for the challenge ahead of it when its split from eBay is finalized.

Despite a series of challenges and missteps from Google Wallet's earliest days, the app has tightened its grip on the Android ecosystem and squeezed out the competition — and Google must now decide whether Apple Pay is its next target or its most unlikely ally.

Uber Technologies Inc. and Capital One Financial Corp. have joined to give the credit-card issuer's customers cheaper rides on the car-sharing service.

When a mobile wallet fails, it doesn't go away. Companies can upgrade dormant apps and remove their functionality, but the apps stay on users' phones, each one a headstone in a growing digital graveyard.

CoinTent, a San Francisco-based micropayments company, has released a product to enable media companies to sell individual articles to non-subscribers.

Amazon long ago redesigned the way consumers shop and pay online, and it envisions a retail environment where payments happen just as seamlessly and shoppers never even need to slow down to check out.

MasterCard is betting that there is a third choice besides plastic cards and mobile wallets. And that choice is one that has sputtered in the past.

Google's rumored bill presentment service, called Pony Express, is still in development and has not been officially announced. But the email-based payment service has the potential to disrupt the banking world — if it can overcome the significant obstacles ahead of it.

MasterCard has joined forces with celebrity chef Marcus Samuelsson to deploy its Qkr app at the product's first restaurant location in the United States.

No two digital wallets are alike, but there is a growing interest within the payments industry in standardizing a base layer for digital payments.

Modern consumer cars may not be as full-featured as the Batmobile or Knight Rider's KITT, but they are getting closer, and a growing number of financial companies want to put their products under the hood.

While Google may be the behemoth in web search, its payments initiatives leave a lot to be desired.

Taco Bell will start its first customer-loyalty program later this year in an effort to keep diners coming into the restaurants regularly.

Apple Pay may be just what the doctor ordered for health care payments, with its emphasis on both security and communication.

Just as the Apple Watch arrives to take over many of the functions of a fitness band, Jawbone has announced a new line of bracelets with payment features just like an Apple product.

Several issuers use card controls to soothe consumer fears, and Discover is building on this foundation to engage consumers at the network level and encourage more frequent and sophisticated use of mobile devices.