From Spotify sent a letter to Apple’s lawyer of “causing grave harm to Spotify and its customers.” The letter says that Apple rejected the new version of the app for Spotify’s iOS, citing “rules of business model” and demanded that Spotify use Apple’s billing system if “Spotify wants to use the app to acquire new customers and sell subscriptions.”

The letter, sent by Spotify general counsel Horacio Gutierrez to Apple general counsel Bruce Sewell on June 26.

“This latest episode raises serious concerns under both U.S. and EU competition law,” Gutierrez wrote. “It continues a troubling pattern of behavior by Apple to exclude and diminish the competitiveness of Spotify on iOS and as a rival to Apple Music, particularly when seen against the backdrop of Apple’s previous anticompetitive conduct aimed at Spotify … we cannot stand by as Apple uses the App Store approval process as a weapon to harm competitors.”

Apple has not responded to a request for comment by Re/Code. – Source: Re/Code.