That GONE error is because you’re calling the deprecated Transactions API with a version of the API that no longer supports it. The previously depreceated Transactions API has been fully removed as of Square API version 2021-10-20. These endpoints will work if you are using Square API versions prior to 2021-10-20. However, these endpoints will eventually be retired from all Square versions.
Fucntionality previously handled by the Transactions API should now be handled by the Payments API. Please see this migration guide for more information. 