The legal battle between Epic Games and Apple is escalating once again. For a second time, the warring factions are going straight to the top of the judicial system. Apple is asking for the Supreme Court to review when and how it can charge commissions on mobile purchases made via third-party payment systems. The business has requested a motion to stay on a lower court ruling regarding the fees Apple charges to software developers using those external financial systems rather than the App Store.

The last time Apple petitioned for an appeal at the top of the judicial branch, it was about a lower court requiring it to allow developers to use third-party payment options. The Supreme Court declined to hear that case. It’s possible that the tech company will once again be denied, although this effort regards specifically limits on commission rates rather than the basic premise of allowing in-app payments to be processed outside the App Store.

Epic Games has been pushing both Apple and Google on the subject of their app store commission fees for years. Recently, the gaming company did appear to reach an accord with Google that saw the company’s popular game Fortnite globally return to the Google Play Store in March. That ruling reportedly requires Epic’s notoriously opinionated CEO to keep quiet on the subject of Google’s app store fees until 2032. Epic Games recently made substantial job cuts, laying off more than 1,000 workers last month.