How to call custom html file on cart checkout (passing product info)?

[snowhiterw]

VirtueMart 2.0.18a

After successfully checking out I need to call a custom html file that will receive the information for the products in the cart so I can update the customer's purchase information (product, price, tax, today's date etc) in our subscriber database.  This form will ask for username, password and if they are not already in our database, it will ask for the registration information we need to track.  Then it will update our database record with the latest purchases.

Where do I place a call to load the .html file and with what syntax.... perhaps after the confirmation e-mail is sent.