show form values on submit - handy when setting up Ubercart with Cybersource
To see what values are being sent to Cybersource insert this snippet on line 204 of uc_cybersource.module .
This should help you spot any invalid fields that would make the transaction fail.
Snippet:
drupal_set_message(''. print_r($data, TRUE) .'');
if devel module is installed : use dsm($data)