L<FS::svc_external> - Externally tracked service class.
+L<FS::svc_pbx> - PBX service class
+
+L<FS::svc_cert> - Certificate service class
+
L<FS::inventory_class> - Inventory classes
L<FS::inventory_item> - Inventory items
L<FS::cust_main_note> - Customer note class
+L<FS::cust_note_class> - Customer note classification class
+
L<FS::banned_pay> - Banned payment information class
L<FS::cust_bill> - Invoice class