Google adwords on form submit

Hi there,
Just wondered if anyone knew how to use the google ad words conversion tracking code with contact form 7?

A conversion for a particular project is the lead based on the contact form being completed, so I just wondered where the tracking code should do so it tracks when the user has filled in the form and submitted?

Thanks,
Craig

https://ww.wp.xz.cn/plugins/contact-form-7/