Europe’s antitrust regulator accused Apple (NASDAQ: AAPL) of disallowing rivals'’ access to its payment technology, if regulators decided to move, the tech giant might become obliged to change its system. 

The European Commission said in a press release Monday that it had “informed Apple of its preliminary view that it abused its dominant position in markets for mobile wallets on iOS devices.”

The European Commission delivered a statement of objections to Apple citing suspected violations of Europe’s antitrust law, but the investigation is still running, and the outcome isn’t determined yet. Apple can still review and respond to the commission’s findings. 

The executive body of the EU said it had found that Apple restricted rivals in the mobile wallets market on its iPhone operating system by putting limitations on near-field communication (NFC). 

“In our Statement of Objections, we preliminarily found that Apple may have restricted competition, to the benefit of its own solution Apple Pay,” Margrethe Vestager, the commission’s competition chief and executive vice president, said in a statement. “If confirmed, such a conduct would be illegal under our competition rules.”

They added that Apple’s NFC technology accessibility limitations to third-party app developers of mobile wallets “has an exclusionary effect on competitors and leads to less innovation and less choice for consumers for mobile wallets on iPhones.”

“Apple Pay is only one of many options available to European consumers for making payments, and has ensured equal access to NFC while setting industry-leading standards for privacy and security,” an Apple spokesperson said in a statement Monday. “We will continue to engage with the Commission to ensure European consumers have access to the payment option of their choice in a safe and secure environment.”

Apple also expressed concern that changes to its payments system could result in a less secure process.