I'm testing unity-store and find several issues.

Unity never gets an onMarketPurchaseCancelled event because it is blocked by onActivityResult.

Unity never gets an onUnexpectedErrorInstore because of a typing error.
(UnitySendMessage calls onUnexpectedStoreError)

We are still testing and handling other issues (restoreTrasaction should call queryInventory without sku details to avoid  network connection.)