App Store: apps can now link to outside account management

[Cmaier]

Update on “reader” app distribution - Latest News - Apple Developer

Last year, Apple announced an update coming to the App Store in early 2022 that would allow developers of “reader” apps to include an in-app link to their website for account creation and management purposes. Starting today, with the update of App Store Review guideline 3.1.3(a), developers of...

developer.apple.com

You need to get an entitlement from Apple for this to work. Once set up:

Apps may allow a user to access previously purchased content or content subscriptions (specifically: magazines, newspapers, books, audio, music, and video). Reader apps may offer account creation for free tiers, and account management functionality for existing customers. Reader app developers may apply for the External Link Account Entitlement to provide an informational link in their app to a web site the developer owns or maintains responsibility for in order to create or manage an account.