I just corrected this problem by installing the newest Square module available in the plugins AND updating to the newest Production API Version in Square.
I did not have to change the App ID or Access Token this time around.
Also, I needed to remove and re-add the module in Zen Admin Payments to clear the loose ended errors.
Zen Cart 1.56c - Twitch Base6 - Sonic (The Base6 code has no effect on how Square works with Zen relative to this module or the errors).
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