App Store Connect (formerly iTunes Connect) is a suite of web-based tools created for developers to submit and manage their apps for sale via the App Store.

In App Store Connect you will be able to check the status of your contracts, manage App Store Connect and test users, obtain sales and finance reports, view app crash logs, request promotional codes, set up iAd Network and Game Center preferences, as well as add or manage app metadata, binaries, and In-App Purchases.

More information: Apple Support page about App Store Connect