Walmart is in talks with several mobile wallet companies to offer more payment options in its Walmart Pay app, an executive at the world’s largest retailer said, after signing up J.P. Morgan Chase last week.

Starting next year, Chase Pay jpm will become the first third-party digital wallet on Walmart’s website and app, they said on Thursday.

Customers can pay within the app with any major credit, debit, pre-paid, or Walmart gift card.

Daniel Eckert, senior vice-president of services at Walmart U.S., said in an interview late on Friday that the retailer would tweak its marketing for the app after the most frequent users turned out to be Gen X customers, born from 1965 to 1967, and baby boomers born from 1946 to 1964.

“The target demographic during the launch of a technology product tends to be younger, more male, so we have had that target market in mind,” Eckert said.

U.S. mobile payments accounted for an estimated $67 billion in 2015, and are expected to grow this year to $83 billion, or 24% of all purchases made via smartphones, according to the latest Forrester Research data.

Apple’s Apple Pay aapl or Alphabet’s Android Pay goog are the most popular digital wallets, and U.S. retailers have launched many mobile payment apps in the last two years. But acceptance has been slow, largely because most systems require new equipment at stores.

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Walmart Pay wmt was launched in December 2015 and can be used in all of the retailer’s 4,600 U.S. stores. Customers at the checkout counter must choose the payment option within the app on their smartphone, and activate the camera to scan the code at the register. An e-receipt is sent to the app.

Eckert also said more than 90% of transactions on the app involve customers are using the service more than three to four times a month. He declined to give the overall number of users who use Walmart Pay.

Walmart leads a consortium of U.S. retailers developing a mobile wallet app called CurrentC. The group, which includes Target tgt and Best Buy bby , said earlier this year it would delay launching the app after the project hit several roadblocks.