Integrating Payment Gateway with Virtuemart

[uthpala]

Hi,
In the site we are developing  using Joomla, we use payment gateway inside it(Sampath bank Payment Gateway) for several payment requirements. Now we've  installed virtuemart in our site, as we've got the requirement of a  shopping cart. And we need to integrate our existing payment gateway with it. We are not supposed to use a built is payment methods like Paypal,Payzen,Authorize.net.etc.
How can we proceed with this? Any help would be appreciated/
Can u provide any guide on how to add it as a new payment method ? What should be additionally developed ?
Or can i customize existing builtin payment method ?

[Maxim Pishnyak]

I think you could check Dev Portal at the top of the current page.

[jenkinhill]

Some information on developing plugins: http://docs.virtuemart.net/tutorials/34-development/84-extension-plugins.html

[uthpala]

Thanks for the replies....