+=item owed
+
+Returns the total amount owed for all associated invoices.
+
+=cut
+
+sub tax { shift->_total('tax', @_); }
+sub charged { shift->_total('charged', @_); }
+sub owed { shift->_total('owed', @_); }
+
+#don't show previous info
+sub previous {
+ ( 0 ); # 0, empty list