I need to create an iframe to my 3rd party payment provider that will do the acutal payment in the checkout process of drupal commerce.

In this iframe the user will actually insert his credit card details.

What is the best way to accomplish this? I need this(ofcourse) to interact with the commerce checkout process.

I thought about creating a checkout pane and insert my iframe there, but then i will need to deal with all the security issues and it just seems wrong(in that case i will have 2 "continue" buttons, the one on the iframe and the one on the checkout process)...

If its a returning question(i didn't find any) then i'm sorry and pls send me to the reference.

10x!