The App Store Connect service is a version of iTunes Connect adapted exclusively to the needs of application developers.
With App Store Connect, developers can manage their apps in the App Store: create an app page, include IAP there, test it, download updates, analyze statistics, respond to user reviews.
Apps for iPhone, iPad, Mac, Apple Watch, Apple TV and iMessage will be linked to the App Store Connect. And iTunes Connect was left to manage and sell music releases, movies, TV shows and books.
The new service has opened a website, and it is also available as an application. iTunes Connect automatically redirects app developers to the App Store Connect, the interface and functionality of the two services are practically the same.