showInAppMessagesIfNeeded
fun showInAppMessagesIfNeeded(activity: Activity, inAppMessageTypes: List<InAppMessageType> = listOf(InAppMessageType.BILLING_ISSUES))
Google Play only, no-op for Amazon. Displays the specified in-app message types to the user as a snackbar if there are any available to be shown. If PurchasesConfiguration.showInAppMessagesAutomatically is enabled, this will be done automatically on each Activity's onStart.
For more info: https://rev.cat/googleplayinappmessaging