Add a Shopper Manualy using a external FORM

[Jorge Moises]

Hello, i am using Joomla 2.5.4 and VM 2.0.6, i have made a form using fabrik with all the information that the sites need, includes user information, address, and other information, when the user sign up in the form automaticaly create the user in joomla, i need to be able to add from the same form a user/shopper to VM, because in the order proceess we dont what to let the user edit information to make the checkout faster, can somebody point me directions or instructions of how can i ADD a Shopper using PHP code what function i have to use?

Many thanks for the help!