+=item addon_pkg_class
+
+Returns the add-on package class, as an FS::pkg_class object, or the empty
+string if there is no add-on package class.
+
+=cut
+
+sub addon_pkg_class {
+ my $self = shift;
+ if ( $self->addon_classnum ) {
+ qsearchs('pkg_class', { 'classnum' => $self->addon_classnum } );
+ } else {
+ return '';
+ }
+}
+