Here's what Apple had to change as a result of the Epic Games legal battle

Apple changed the rules of its U.S. App Store on Tuesday in what appears to be the final result from the long-running Epic Games antitrust challenge against Apple.

On Tuesday, the U.S. Supreme Court declined to take up appeals on the case, bringing an end to the legal saga, and allowing changes stemming from earlier decisions to come into effect.

Apple will allow app makers selling to U.S. customers to add links and buttons inside their apps that bring users out to a website where they can input their credit card information. This was previously banned. In the past, Apple developers had to use Apple's billing system for digital goods like game coins — which takes a 15% to 30% cut — and couldn't tell users that prices can be cheaper on the web.

However, Apple now requires that companies that use their own billing system have to offer Apple's as well — it can't be a replacement.

Apple said that iPhone and iPad developers have to apply for a software tool, called an entitlement, in order to offer the link or button. Apple will also collect a commission, as much as 27%, from apps that handle their own billing, according to court filings on Tuesday and updated App Store guidelines.

The shift is the most tangible result from Epic Games' legal challenge to the App Store. However, it doesn't go far enough for Epic Games CEO Tim Sweeney, he said in a statement on Tuesday.

"The court battle to open iOS to competing stores and payments is lost in the United States," Epic Games CEO Tim Sweeney said. "A sad outcome for all developers."

Apple's policies over U.S. billing resemble how the company has handled regulations in the Netherlands and South Korea. Apple's policy to continue to collect commissions could be a significant barrier that