Advert export style and canvas problem

Hello,

I've created a game on facebook, and I don't know why if I export the game with the option Advert bar style, the facebook payments doesn't work.

With the Normal style they work correctly, and I've read that is a matter of canvas and iframe.

With advert style the index.html created and iframe, and with normal everything is on canvas. Facebook only accepts payments from a canvas.

Is there a way to create or put the canvas inside the iframe?

Thanks,

Sergio