dave,
i do not run a production site using square. so hard for me to say exactly.
when running a cron job for the handler, you should check how you have the output configured for your cron jobs. there will be output there, but that output is completely handled via cron.
it does NOT look like this module will generate a php log (ie, a zen-cart log) on successful token refresh. but the cron job will have output.
when doing a manual refresh, there will be a php log (ie a zen-cart log) even when there is a successful token refresh.
hope that helps.
best.
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