To get descriptive output for debugging, you can TEMPORARILY edit square_handler.php and change line 11, which says:
and change false to true.Code:$verbose = false;
NOTE that this may prevent normal transactions from operating properly until you put it back to false.
With $verbose=true, it will give output with one of:
not configured = module doesn't have an Application ID set
failure = token expired more than 15 days ago, or no token available to refresh
refreshed = the job refreshed the token
not refreshed = a refresh was attempted, but did not complete properly
not expired = a token exists but it is younger than 3 weeks old, so no need to refresh



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