How to show user info on the Receipt page

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Hey all, I'm new to osCommerce, and so maybe I have been looking in the wrong place... What I need is a way to show the customer information on the receipt page, after a successful purchase. I am using e-xact as my merchant, so there is not a real 3rd party cart involved. I guess the receipt page is called 'checkout_success.php"

 

Has anyone else ever needed to do this? and/or can anyone let me know how this can be done?

 

Thanks