showInAppMessages

Shows Google Play's in-app messages for the current user, if any apply.

The main use is recovering subscriptions whose payment was declined: rather than silently losing the subscriber, Play displays a fix-your-payment flow inside your app. Google recommends calling this on every foreground entry into the app for apps that sell subscriptions.

When the user recovers a purchase, this class refreshes its own state before invoking onSubscriptionRecovered, so isPurchased is already correct by the time the callback runs.

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