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I am also experiencing an error. Invalid Payment Error when processing transactions.
It has happened with each update from 7.4.0 and on. I have managed to stop the conflict and continue to accept payments by downgrading to 7.4.0 after updating to 7.5+
Support has suggested via email that I upgrade, which is what prompted my original inquiry – the upgrade broke my payment system. Downgrading back fixed it. But – how long will this be a viable fix?