https://techcrunch.com/2020/02/05/apple-unifies-its-app-stores-by-extending-the-universal-purchase-option-to-mac-apps/

Apple surprised its app developer community today with the official announcement that they’ll soon be able to sell their cross-platform apps as one universal purchase including, for the time, apps that run on macOS. For consumers, a universal purchase option allows them to just pay once for an app that works across devices, including iPhone, iPad, Apple TV, and/or Mac. Developers, meanwhile, will be able to entice customers to buy their Mac and iOS app together, or other combinations of apps. They’ll also be able to more easily sync customers’ in-app purchases and subscriptions across platforms.

Apple says support for universal purchase will roll out in March 2020.