Following investigation from Japan Fair Trade Commission Apple agreed to loosen App Store rules to allow developers adding sign up flow to their apps which happens outside the app and allows to pay for subscription outside the app itself.
This change will go into effect early 2022 with corresponding App Store Review Guidelines update.
This update goes in line with previous agreement to allow developers to notify users of other payment methods via email communications.
Apple Newsroom: Japan Fair Trade Commission closes App Store investigation
Developer:Business as usual.
QA engineer:Business as usual.
PM/DM:Consider adding sign up flow to existing ‘reader apps’.