App Store Connect is a suite of tools used by members of the Apple Developer Program to publish and manage apps, in-app purchases, in-app events, and other content. Invite people to beta test your app with TestFlight, add tax and banking information to receive payments, access sales reports, view analytics, and much more.
Initially, only the Account Holder (the person who joins the Apple Developer Program) has access to App Store Connect. Later, the Account Holder can create additional users in App Store Connect and assign specific roles. App Store Connect is available on the web and as an app for iOS and iPadOS.