Is it necessary to verify an app on Google so you don’t lose connection with google calendar?

Hey everyone, im currently developing appointment systems, but google calendar credentials fail after 15 days. Im currently on the test app, so my question is if its necessary to create and verify an app on google cloud so I sing more users and don’t lose connection?

The token expiration is set to 7 days for the testing mode (see here). It is likely that you need to publish/verify the app to overcome the short lifecycle of the token. It is also mentioned here.

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