+processing return return values are:
+
+=over 2
+
+=item '0' - Do not refund
+
+=item 'refund' - Refund the lost item processing charge
+
+=item 'restore' - Refund the lost item processing charge and restore the original overdue fine
+
+=item 'charge' - Refund the lost item processing charge and charge a new overdue fine
+
+=back
+
+