I am taking an app implemented in Flutter from iOS and Android to Amazon Appstore. It seems to work also on Amazon apart from that Revenuecat does not recognize when I offer a free trial in the beginning of a subscription on Amazon. (On Google Play and Apple App Store it works without problem.) And I know that there indeed is a free trial enabled, because when I click the subscription the Amazon window tells me so too.
Please make sure that RevenueCat do recognize free trials on subscriptions on Amazon when using Flutter.