By August 31, 2024 (at the latest), all new apps and updates to existing apps will be required to use version 6 of the Billing Library or later. If you need more time to update your app, you can request an extension until November 1, 2024.
I believe the current version of the plugin.google.iap.billing.v2 plugin was already updated to support version 6 a few months ago. You’ll just need to rebuild and update your app.
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Also the issue could be caused because of internal or open testing past releases etc.
I guess in that case you should update them too.
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