I've seen this warning 'From November 1, 2023, all app updates must use Billing Library version 5 or newer.' Does the current version of IAP plugin support billing library version 5?
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See these posts:
construct.net/en/forum/construct-3/general-discussion-7/discontinuation-support-177127
construct.net/en/forum/construct-3/general-discussion-7/outdated-android-billing-177148