+ 'key' => 'previous_invoice_history',
+ 'section' => 'invoicing',
+ 'description' => 'Show a month-by-month history of the customer\'s '.
+ 'billing amounts. This requires template '.
+ 'modification and is currently not supported on the '.
+ 'stock template.',
+ 'type' => 'checkbox',
+ },
+
+ {