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Patreon will have to use Apple's in-app purchase system or be removed from the App Store
(www.engadget.com)
This is a most excellent place for technology news and articles.
Does this mean Patreon too will have two tiers of billing system: standard billing via the Web and slightly higher prices if done in app. I think if one purchases a YouTube Premium membership in app on iOS, it costs more than when done via the site.
Yes, that's exactly what they're doing. If you have a Patreon, you must choose between increasing patreon price on Apple specifically compared to Android and Web, or you can keep the price the same, in which case you will earn less from users using iOS in-app purchase