How can I display detailed Authorize.net error code info from civicrm_system_log in the Civi interface?
I might be on deep water here, but I would propose this workflow:


You create a new CiviRules trigger to trigger on System_log created. That would probably be as simple(?!) as to copy another trigger like Contact created or Contribution created, and replace the values with details on system_log.
You have a condition on field value comparison for a value in system_log that is unique for failed Authorize.net-payments.
Action is to schedule an activity to the appropriate staff member, and include in the activity detail the URL for the API Explorer site, filled in with tokens to show the value for the corresponding system_log (the same way as checksum is used)