» Digital wallets:

‘Our ultimate goal is to replace the wallet,’ executive says.

Apple, Google and Samsung are adding features to invite shoppers to use smartphones to pay for purchases,

The tech industry has been saying for years that smartphones would make traditional wallets obsolete. But most people still use cash or plastic when they shop in stores.

That could change later this year when three leading tech companies are promising to give shoppers more reasons to use “digital wallets.”

Apple said last week that it’s adding store-issued credit cards and store rewards programs to Apple Pay, the mobile payments service it launched last fall. Google is readying a similar service for millions more smartphones to run on its Android software. And Samsung promises a service for its newest Galaxy smartphones will be accepted in more stores than both Apple Pay and Google’s Android Pay.

“Our ultimate goal is to replace the wallet,” Apple vice president Jennifer Bailey told software developers last week.

The new options come as numbers show mobile payments are still in their infancy: About 16 million U.S. shoppers used smartphones to pay for $3.5 billion in store purchases last year, according to the eMarketer research firm. That includes payments with Apple Pay, other services like PayPal and apps from merchants like Starbucks and Dunkin’ Donuts.

While that’s a tiny slice of the $4.3 trillion spent in stores overall last year, eMarketer expects mobile payments will grow to $27.5 billion in 2016.

“We’re still in this very early stage of laying the groundwork to be able to make this happen,” said analyst Brian Yeager at eMarketer. “But there’s progress being made.”

The progress follows years in which the industry has struggled to get digital wallets off the ground as major players failed to agree on technical standards, security measures and financial terms. Some big merchants have balked at services developed by Apple or Google, saying they’d rather build and control their own system.

Still, Apple opened the door for widespread adoption of digital wallets last year when it launched Apple Pay with endorsements from major banks and retail chains. With Apple Pay, which only works on the latest models of iPhones and the Apple Watch, users link a credit card or bank account to their iPhone.

Once that’s done, a user only has to hold the phone next to a device at a store counter. The phone and the store device communicate wirelessly, prompting the user to authorize payment by pressing the phone’s fingerprint sensor instead of swiping a plastic card. Apple Pay uses encrypted codes to protect shoppers’ financial information.

Apple says shoppers and merchants have embraced Apple Pay, although it hasn’t released usage details.

One early fan is Allison Lucas, a 35-year-old tech worker who tapped her Apple Watch to pay for a box of breakfast cereal and other items at a Walgreens store in San Francisco’s Financial District last week.