I was also wondering if the plugin: google.iap.billing.* was using the v3 version that I saw in the email alert from Google. I just uploaded an update to an app today and I received a warning that the version used in my app is not the latest. Note that I am using the google.iap.billing.* plugin.
We’ve detected that this app is using an old version of Google Play Billing. By November 1, 2021, all app updates must use Billing Library version 3 or newer. Update to Billing Library 3 before this date. Learn More about Billing Library 3..
Will try to get this information to Vlad.