Spotify says Apple is making it harder for the streaming music company to compete by blocking a new version of its iPhone app.
In a letter sent this week to Apple's top lawyer, Spotify says Apple is "causing grave harm to Spotify and its customers" by rejecting an update to Spotify's iOS app.
The letter says Apple turned down a new version of the app while citing "business model rules" and demanded that Spotify use Apple's billing system if "Spotify wants to use the app to acquire new customers and sell subscriptions."
More from Recode:
You are still watching a staggering amount of TV every day
SolarCity appoints a two-person committee to decide whether to sell to Tesla
Tech's newest obsession is finding ways to overhaul cities
The letter, sent by Spotify general counsel Horacio Gutierrez to Apple general counsel Bruce Sewell on June 26, suggests that Spotify intends to use the standoff as ammunition in its fight over Apple's rules governing subscription services that use its App store. (Correction: An earlier version of this story incorrectly reported the date Spotify sent the letter.)