JPMorgan Chase & Co.’s payments processing unit is partnering with fintech Klarna to expand buy now, pay later options for its merchants.

JPMorgan Payments will provide some 900,000 businesses the ability to offer Klarna’s fast-credit options to their customers, according to a statement Monday.

It means Klarna, which is targeting a U.S. initial public offering this year, will be available through the world’s largest merchant acquirer, which processes $2 trillion payments a year.

“We in the more recent years have become a third party network like Amex and PayPal,” Sebastian Siemiatkowski, chief executive officer of Klarna Group Plc, said in an interview with Bloomberg News. “We are a bank, so this is the natural evolution. We are moving into a world with increased competitive pressure with retail banking services.”

The Stockholm-headquartered fintech has added Stripe, Adyen, and Worldpay to its distribution roster in recent months, after selling its own checkout business last year.

Klarna, which has 85 million customers globally, has been rapidly expanding in the U.S. An American banking license is one of the options Klarna is exploring, which would give the firm the ability to “control even more customer experience and provide a richer service,” Siemiatkowski said.

For JPMorgan, the tie-up represents another toehold in buy now, pay later credit — this time through its payments business, which helps merchants around the world take payments from customers.

In the bank’s credit card division, executives banned customers from using Klarna or Affirm Holdings Inc. last year. They argued at the time that such options “are a form of credit” and that the bank did “not generally allow customers to pay for credit products” with their credit cards. For those customers, JPMorgan has long had its own buy now, pay later option known as Chase Pay Over Time.

It’s also a further sign of a maturing fintech sector, with more firms providing their technology to incumbent banks. Wise Plc, for instance, said late last year it was teaming up with Morgan Stanley and Standard Chartered to offer its foreign exchange infrastructure.