ZC 1.5.5f
PHP 7.1.33
MySQL 5.7.23-23
Square 0.97

I've got a cron job that runs on odd numbered days to refresh OAuth. It's been running quietly for months. A bit over a week ago, it's been triggering the following error:
Code:
[19-Dec-2019 00:00:02 America/Los_Angeles] PHP Fatal error:  Uncaught Error: Class 'square' not found in /*****/********/public_html/mystoredomain/square_handler.php:21
Stack trace:
#0 {main}
  thrown in /*****/********/public_html/mystoredomain/square_handler.php on line 21
I've verified that the cron is running PHP 7.1.33.

My host changed how they serve up PHP on December 17 that bumped the PHP version my cart used to 7.3, which triggered numerous errors/warnings. I went into the control panel and backed PHP down to 7.1.33. I've been getting the cron triggered errors since then.

I haven't done any significant changes to the cart in this time frame. Square payments are being processed normally.

I would appreciate any thoughts and suggestions on how to fix this.