order-details

Operator 'order-details' is called when reviewing an order ???

@param $op
  'order-details'
@param $arg1
  current order being reviewed

@return
  The appropriate text and or form

In the example the delivery date can be changed.

<?php
case 'order-details':
  if (
variable_get('uc_cod_delivery_date', FALSE)) {
   
$details .= uc_strip_form(drupal_get_form('uc_payment_method_cod_form', $arg1));
  }
  return
$details;
?>