The package in_app_purchase version 0.6.0 removed the method queryPastPurchases saying:

The InAppPurchaseConnection.queryPastPurchases method has been removed. Instead, you should use InAppPurchase.restorePurchases

Use case

Restoring purchases is not the only use case of queryLastPurchases.
I use it during my purchase process to detect an existing subscription and propose an upgrade rather than creating a new subscription (with ChangeSubscriptionParam).
Going through purchaseStream is not convenient.

Proposal

Please consider adding queryPastPurchases back for android.