Apple was the target of two EU antitrust investigations into its App Store and Apple Pay on Tuesday, when regulators said its terms and conditions and restrictions may violate the block's competition rules.
The European Commission said an investigation will look into the mandatory use of Apple's proprietary in-app buying system and restrictions on the ability of developers to inform iPhone and iPad users about other cheaper options outside of apps.
The case was triggered by a complaint from the Swedish music streaming service Spotify last year. Another smaller rival filed a similar complaint regarding e-books and audio books in March of this year.
"It appears that Apple has been given a 'gatekeeper' role in distributing apps and content to users of Apple's popular devices," said Margrethe Vestager, EU competition commissioner, in a statement.
The second case focuses on Apple's terms and conditions of how Apple Pay is to be used in merchant apps and websites, and the company's refusal to allow competitors to access the payment system.
Apple Pay was launched in 2014 and marks the company's diversification from the sale of devices such as iPhones and iPads.