I too have run into these errors consistently and I sell large ticket items, I am contemplating switching providers as it does not look good to my clients when they get Postal Code errors and there is in fact, no discrepancy between their postal codes. I will always send them a Square invoice when their transaction online fails and it goes through.
This is urgently needing to be fixed, please share our frustration with your developers as I really do like Square and don’t want to go through the hassle of changing. It’s quiet concerning to see reports of this being made and it not being addressed months later.
The error that is in fact not an error:
Square Payment Failed (Status code BAD_REQUEST: The postal code in billing address doesn’t match the one used for card nonce creation.)